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IP troubleshooting for
lte
Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 2
Agenda
Upon completion of this chapter, the student will be able to:
› Understand the E-UTRAN transport network
› Understand the Ethernet connection of the DUL board
› Configure the eNB transport MOs
› Understand the transport network security of the eNB
› Monitor the performance of the transport network
› Understand how to dimension and plan the IP backhaul
Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 3
OVERVIEW OF EPS
S-GW
S1-UP
S1-CP S1-CP
X2-CP
eNodeB eNodeB
MME
S1-UP
P-GW
MME
S5/S8
S10
S11
Internet
X2-UP
EPC
E- UTRAN
HSS
S6a
SGi
PCRF
Gx
Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 4
ENODEB FUNCTIONALITY
S-GW
S1-UP
S1-CP S1-CP
X2-CP
eNodeB eNodeB
MME
S1-UP
P-GW
MME
S5/S8
S10
S11
X2-UP
EPC
E- UTRAN
HSS
S6a
PCRF
Gx
-Terminates all user plane
functions seen by the terminal
(including security)
-Radio Bearer control
-Radio Admission control
-Connection mobility control
-UL/DL scheduling
-IP header compression and
encryption of user data streams
-Measurement and
measurement reporting
configuration for mobility and
scheduling
Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 5
MME FUNCTIONALITY
S-GW
S1-UP
S1-CP S1-CP
X2-CP
eNodeB eNodeB
MME
S1-UP
P-GW
MME
S5/S8
S10
S11
X2-UP
EPC
E- UTRAN
HSS
S6a
PCRF
Gx
-Authentication
-NAS signaling
-GW selection
-Roaming (S6a to home HSS)
-Bearer management
-Idle mode tracking
-Paging
-Inter-MME and IRAT mobility
-NAS Ciphering and Integrity
Protection
Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 6
SGW / PGW (CPG) FUNCTIONALITY
S-GW
S1-UP
S1-CP S1-CP
X2-CP
eNodeB eNodeB
MME
S1-UP
P-GW
MME
S5/S8
S10
S11
X2-UP
EPC
E- UTRAN
HSS
S6a
PCRF
Gx
-In visited network in case of
roaming
-Intra-LTE mobility anchor
-Packet routing & forwarding
-Lawful intercept
-LTE idle mode DL buffering
-Charging per UE, PDN and QCI
-Bearer findings for PMIP S5/S8
-Security for user data on S1
-External IP point of interconnect
-IP address allocation
-Packet routing & forwarding
-Lawful intercept
-Policy enforcement
-In home or visited network
Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 7
PCRF FUNCTIONALITY
S-GW
S1-UP
S1-CP S1-CP
X2-CP
eNodeB eNodeB
MME
S1-UP
P-GW
MME
S5/S8
S10
S11
X2-UP
EPC
E- UTRAN
HSS
S6a
PCRF
Gx
-Provides Service Data Flow
gating
-Set QoS for each Service Data
Flow
-Define Charging for each
Service Data Flow
-Enables Bearer QoS Control
-Correlation between
Application and Bearer
charging
-Notification of bearer events to
application function
-Bearer findings towards SGW
for PMIP based S5
Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 8
HSS FUNCTIONALITY
S-GW
S1-UP
S1-CP S1-CP
X2-CP
eNodeB eNodeB
MME
S1-UP
P-GW
MME
S5/S8
S10
S11
X2-UP
EPC
E- UTRAN
HSS
S6a
PCRF
Gx
-Maintain and provide
subscription data
-User identification handling
-Access authorization
-Provide Keys for authentication
and encryption
-User registration management
-Maintain knowledge of used
PDN GW
Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 9
All ip
MME
Uu
RRC
PDCP
RLC
MAC
S1AP
SCTP
PHY
GTP-C
UDP
IP
L1/L2
GTP-C
UDP
IP
L1/L2
GTP-C
UDP
IP
L1/L2
SGW PGW
S1-MME S11 S5
NAS
RRC
PDCP
RLC
MAC
S1AP
SCTP
NAS
GTP-C
UDP
Uu SGW PGW
S5
S1-U
PDCP
RLC
MAC
PDCP
RLC
MAC
PHY
GTP-U
UDP
IP
L1/L2
GTP-U
UDP
IP
L1/L2
GTP-U
UDP
IP
L1/L2
GTP-U
UDP
IP
L1/L2
L1/L2
Appl. IP
PHY
PHY
Appl. IP
eNodeB
eNodeB
IP
L1/L2
IP
L1/L2
IP
L1/L2
Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 10
latency and capacity
R99
HSPA
HSPA+
LTE
2005 2007 2009 2011
2003
150Mbps
28Mbps
14Mbps
384Kbps
CAPACITY
150ms
100ms
50ms
10ms
LATENCY
Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 11
S1 Interface
S1-AP
Transport
Network
Layer
GTP-U
UDP
IP
Data link layer
Physical layer
User Plane
PDUs
SCTP
IP
Data link layer
Physical layer
Radio
Network
Layer
Control Plane User Plane
Transport Network
User Plane
Transport Network
User Plane
Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 12
X2 INTERFACE
X2-AP
Transport
Network
Layer
GTP-U
UDP
IP
Data link layer
Physical layer
User Plane
PDUs
SCTP
IP
Data link layer
Physical layer
Radio
Network
Layer
Control Plane User Plane
Transport Network
User Plane
Transport Network
User Plane
Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 13
DIGITAL UNIT for lte (DUL)
› Prepared for high peak rates
– 2x2 MIMO
– 64QAM DL&UL
› Capacity
– Up to 1000 users
– Up to 173Mbps DL throughput
– Up to 56Mbps UL throughput
› IP Transmission capability
– All IP architecture with full-non blocking
connectivity
– 100/1000BASE-T
– SFP slot for 1000BASE-X
Timing function
Loadable software
DL & UL baseband processing
IP traffic management
Radio interface
Transmission handling
Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 14
IP/Ethernet connectivity
DUL Step 2+
w/Removal of OAM Cable
Fast
Ethernet
Port
Network
Processor
GPM
OAM, etc
Internal
Ethernet
Switch
LCT
SoIP
Baseband
OAM LCT
IP
OAM IP
Tagged
VLANs on
WAN port
TN WAN if
CP/UP IP
Optionally
separate
SoIP IP
Gigabit
Ethernet
Port
Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 15
Transport nw configuration
field-
Slide title
40 pt
lide subtitle
24 pt
Text
24 pt
-5
20 pt
Created By OSS Created on site Created by
Basic Package
(formerly known as Basic CV)
Created on site
if SoIP is used
SwManagement=1 IpSystem=1
Equipment=1 TransportNetwork=1 IpOam=1
ReliableProgramUn
iter=”sctp”
PiuType
Subrack=1
Slot=1
PlugInUnit=1
GeneralProcessorUnit=1
Sctp
Ip=1
IpRoutingTable EthernetLink
(Aut. Created)
ipAccessSctpRef
Syncronization
admActiveSlot
rpuId
IpAccessHostEt=1
Medium Access Unit
activeMau
ExchangeTerminalIp=1
GigabitEthernet=1
IpInterface=2
ipInterfaceMoRef
IpAccessSctp=1
ipAccessHostEtRef1
IpSyncRef=1
IPHostLink
ipInterfaceMoRef
TimingUnit=1
(LCT port
OAM IP
interface)
(GE port
OAM IP
interface link)
IpInterface=1
(Note: Two IPInterface MOs if IPAccessHostEt and IPHostLink
shall use different VLANs.)
Created by on site
if SoIP is used, otherwise
created by OSS,
Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 16
SITE CONFIGURATION
Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 17
Transport sharing
Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 18
MPBN/IPRAN
Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 19
SECURITY DOMAINS
S-GW
eNodeB
MME
P-GW Internet
HSS
Trusted
Untrusted
RRC
integrity & ciphering
NAS signalling
integrity & ciphering
User Plane in Uu
ciphering
IPSEC
integrity & ciphering
Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 20
Key hierarchy in e-utran
USIM / AuC
UE / MME
KASME
K
UPenc
KeNB / NH
KNASint
UE / HSS
UE / eNB
KNASenc
CK, IK
K RRCint
K RRCenc
K
Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 21
Transport network security
Sender Receiver
SeGW SeGW
A to B
X to Y A to B
Inner IP
address A
Outer IP
address X
Outer IP
address Y
Inner IP
address B
A to B
ESP tunnel
Packet transport in tunnel mode as in RFC4301
eNB
eNB host
application Core
network
node
SeGW
function
in CPP
Core
Network
SeGW
A to B
X to Y A to B
Inner IP
address A
Outer IP
address X
Outer IP
address Y
Inner IP
address B
A to B
ESP tunnel
Packet transport in tunnel mode in eNodeB
Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 22
IPSEC in LTE (L10B)
› Ipsec protection will
be available for CN
traffic between eNBs
and SeGWs in the
network.
› O&M traffic is still
protected by
application level
security when the
RBS runs in security
level 3.
› It is optional whether
SoIP traffic should
be IPsec protected
or only bypassed.
This is chosen via
configuration.
eNB_1
SEG_1
HeNB_1
SEG_EPC
MME_1
HMME_1
MME_N
HMME_N
SGw_1
HSGw_1
SGw_M
HSGw_M
eNB_2
SEG_2
HeNB_2
R
EPeNB_2
EPeNB_1
EPEPC
Private
network X
Private network
X
Private network
X
IPsec tunnel (used for
S1 and X2)
FW OSS
OSS
services
OSS traffic not IPsec
protected. (Secure
application layer
protocols are used.)
Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 23
Preliminar IPSEC mom view(TBD)
IpInterface MO
VpnInterface MO
IpAccessHostEt MO
(representing internal IP adr)
IpAccessHostEt MO
(representing external IP adr)
IpSecTunnel MO
AccessControlList MO
IPSec MO IkePeer MO
Definies the outer
subnet address
Defines the inner
subnet address
Represents the inner
IP address of the node
1 *
1
*
1
*
1
*
0..1 0..1
1
*
0..1
*
0..1 0..1
Represents the outer
IP address of the node
Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 24
L10b ipsec simplifications
› Only ESP in tunnel mode will be
implemented. The optional AH
will not be supported.
› The following security features of
ESP will be supported
– Confidentiality
– Integrity service
– Data origin authentication
– Anti-replay protection
ESP ALGORITHMS IKEv2 ALGORITHMS
Ciphering algorithms
- ESP_NULL
- ESP_3DES in CBC mode (168)
- AES in CBC mode (128 & 256)
Ciphering algorithms
- ESP_NULL
- ESP_3DES in CBC mode (168)
- AES in CBC mode (128 & 256)
Integrity algorithms
- ESP_HMAC_MD5 (128)
- ESP_HMAC_SHA-1 (160)
Integrity algorithms
- HMAC_SHA-1-96 (128 & 256)
Pseudo-random functions
- HMAC_SHA-1 (160)
IKE authentication
- RSA (1024 & 2048)
- PSK (128 & 256)
Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 25
BACKHAUL RECOMMENDATIONS
Property Description
Bandwidth
Peak rates of 170 Mbps in the last mile, equivalent to the
peak rate of a 1-sector LTE 20 MHz 2x2 MIMO RBS and
100 Mbps for a 3-sector RBS.
Synchronization Better than 50 parts per billion.
Delay Maximum backhaul delay 50-70 ms
Delay variation
No requirements on delay variation other than those
required when NTPsystem is chosen for frequency
synchronization.
Packet loss No requirements for packet loss ratio on the backhaul.
Packet size
Maximum packet size is 1360B. In case of Ethernet Jumbo
frame support the maximum packet size is 1640B
Lock Time Gaussian PDV% of Packets
16 min
1% packets < 20us during 2h
or
99% < 0.3ms
60 min 99% < 3ms
180 min 99% < 10ms
Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 26
Services qos
QCI Resource
Type
Priority Packet
Delay
Budget
(NOTE 1)
Packet
Error Loss
Rate
(NOTE 2)
Example Services
1 2 100 ms 10
-2 Conversational Voice
2
GBR
4 150 ms 10
-3 Conversational Video (Live Streaming)
3 3 50 ms 10
-3 Real Time Gaming
4 5 300 ms 10
-6 Non-Conversational Video (Buffered Streaming)
5 1 100 ms 10
-6 IMS Signalling
6
6 300 ms 10
-6
Video (Buffered Streaming)
TCP-based (e.g., www, e-mail, chat, ftp, p2p file
sharing, progressive video, etc.)
7 Non-GBR
7 100 ms 10
-3
Voice,
Video (Live Streaming)
Interactive Gaming
8
8
300 ms 10
-6
Video (Buffered Streaming)
TCP-based (e.g., www, e-mail, chat, ftp, p2p file
9 9 sharing, progressive video, etc.)
Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 27
Bandwidth dimensioning
› Dimensioning the Last mile
– Based on the cell peak rate, limited by
› Hardware capacity
› Licensed capacity for the DL
baseband throughput
– Transmission and protocol overhead is
considered
› Dimensioning the IP RAN backhaul
– Inputs:
› Average cell throughput during busy
hour
› Cell peak rate
› Cell throughput in a loaded network
› eNB throughput in a loaded network
› eNB throughput during busy hour
› Transport overhead
– Output:
Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 28
Observability
Property Plane How to monitor
Congestion
User Plane Upper layer protocols such as TCP
Control Plane Number of SCTP retransmissions (Sctp::pmSctpStatRetransChunks)
Traffic Volume
Total (S1, X2, Mul)
DL Traffic: GigabitEthernet::pmIfInOctetsLink1Hi & pmIfInOctetsLinkLo
UL Traffic: GigabitEthernet::pmIfOutOctetsLink1Hi & pmIfOutOctetsLink1Lo
User Plane (S1, X2)
DL Traffic: IpAccessHostEt::pmUdpInDatagrams
UL Traffic: IpAccessHostEt::pmUdpOutDatagrams
Control Plane (S1, X2) Sctp::pmSctpStatSentChunks & pmSctpStatRecChunks & pmSctpStatRetransChunks
UP + CP (S1, X2)
IpInterface::pmDot1qTpVlanPortInFrames & pmDot1qTpVlanPortOutFrames
IpInterface::pmIfStatsIpInReceives & pmIfStatsIpOutRequests
IpAccessHostEt::pmIpInReceives & pmIpOutRequests
Delay & Jitter SoIP
Synchronization::pmHDelayVarBest1Pct & pmHDelayVarBest10Pct & pmHDelayVarBest50Pct
Synchronization::pmMaxDelayVariation
Packet Loss
User Plane Upper layers such as TCP
Control Plane Sctp::pmSctpStatRetransChunks & pmSctpStatSentChunks
Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 29
OBSERVABILITY IN THE FUTURE (TBD)
› New SCTP counters shall specify SCTP traffic-related and
stated-related statistics about each SCTP association.
› New GTP counters specify GTP-U traffic-related statistics
about the GTP-U host (also known as GTP-U endpoint)
› New IP counters specify additional traffic-related statistics
about each IPv4/IPv6 interface including total, multicast,
broadcast and Diffserv codepoint (DSCP) usage statistics.
› Extend the current ICMPv4 counters for the IP traffic host to
support the equivalent ICMPv6 messages
Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 30
IP Transport counters
EtHostMo_getPmCounters -h 1 -t 1
100212-10:35:17 10.62.4.22 7.1y ERBS_NODE_MODEL_A_9_2_COMPLETE stopfile=/tmp/54
$ EtHostMo_getPmCounters -h 1 -t 1
PM counters for host with hostFroId 1
ipAddrErrors=0
ipInDelivers=384399
ipInDiscards=-2
ipInHdrErrors=0
ipInReceivedOctets=-2
ipInReceives=161317
ipInUnknownProtos=0
ipNumFailedAt=-2
ipOutDiscards=-2
ipOutRequests=533274
ipOutRequestOctets=-2
ipReasmReqds=0
ipReasmOKs=0
ipReasmFails=0
ipFragOKs=0
ipFragFails=0
ipFragCreates=0
ipPortUnreachable=0
udpInDatagrams=0
udpInErrors=0
udpNoPorts=-2
udpOutDatagrams=0
icmpInDestUnreachs=0
icmpInEchoReps=0
icmpInEchos=0
icmpInErrors=0
icmpInMsgs=0
icmpInParamProbs=0
icmpInRedirects=0
icmpInSrcQuenchs=0
icmpInTimeExcds=0
icmpOutDestUnreachs=0
icmpOutEchoReps=0
icmpOutEchos=0
icmpOutErrors=-2
icmpOutMsgs=0
icmpOutParamProbs=-2
EtHostMo_getPmCounters
EtHostMo_getPmCounters -h <hostFroId> -t <typeOfCounters>
..where..
EtHostMo_getPmCounters is mandatory and name of the COLI
command
-h <hostFroId> is mandatory
-t <typeOfCounters> is mandatory, possible values:
1 - all PM counters
2 - ip PM counters
3 - icmp PM counters
4 - udp PM counters
Example:
EtHostMo_getPmCounters -h 1 -t 1
Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 31
IP connectivity
EtHostMo_startPing
EtHostMo_startPing -d <destIpAddr> -h <hostFroId> -c <noPings> -s <pktSize>
..where..
EtHostMo_startPing is mandatory and name of the COLI command
-d <destIpAddr> is mandatory (dotted decimal notation)
-h <hostFroId> is mandatory (integer > 0)
-c <noPings> is optional (default value 4)
-s <pktSize> is optional (default value 56 byte ICMP payload)
Example:
EtHostMo_startPing -d 192.168.1.2 -h 1 -c 25 -s 18
EtHostMo_stopPing
EtHostMo_stopPing -d <destIpAddr> -h <hostFroId>
..where..
EtHostMo_stopPing is mandatory and name of the COLI command
-d <destIpAddr> is mandatory (dotted decimal notation)
-h <hostFroId> is mandatory (integer > 0)
Example:
EtHostMo_stopPing -d 192.168.1.2 -h 1
Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 32
IP CONNECTIVITY
EtHostMo_startTraceRoute
EtHostMo_startTraceRoute -d <destIpAddr> -h <hostFroId> -q <nQueries> -s <pktSize> -f <firstHop> -m <maxHop> -w <waitTime>
..where..
EtHostMo_startTraceRoute is mandatory and name of the COLI command
-d <destIpAddr> is mandatory (dotted decimal notation)
-h <hostFroId> is mandatory (integer > 0)
-q <nQueries> is optional (default value 4)
-s <pktSize> is optional (default value 56 byte ICMP payload)
-f <firstHop> is optional (default value 1)
-m <maxHop> is optional (default value 40)
-w <waitTime> is optional (default value 5)
Example:
EtHostMo_startTraceRoute -d 192.168.1.2 -h 1 -q 5 -s 18 -f 3 -m 60 -w 3
Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 33
O&M capture
Dumpcap
dumpcap started on le0
Dump is stored in 000100!/d/logfiles/sniffer/default/eth.cap
Total size of capture files are limited to 10000000 Bytes.
Tracing will be automaticaly stoped after 900 seconds
Warning: Capacity for OAM/communication is reduced while dumpcap is tracing.
Pcapexplorer
Lists dumpcap traces. Traces can be deleted with the -d option
$ pcapexplorer
dumpcap traces stored in 000100!/d/logfiles/sniffer/
NAME: SIZE: CREATED: LAST-TRACE:
===== ===== ======== ===========
default 426136 2010-02-12 09:53.54 2010-02-12 09:53.54
QUOTA: 10000000
TOTALT USED: 426136
Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 34
Sctp coLI
sctphost_stat -assoc -all
$ sctphost_stat -assoc -all
sctphost_stat - START.
|-------------------------------------------------------|
|----------------------- SCTP HOST ---------------------|
|RpuId: 17
|SctpInstId: 0
|Base State: BASE_RUN
|Host State: A|C|R|X|IA
|Ext. client: CONNECTED
|Alarm Timer: NOT RUNNING
|---------------- SCTP ASSOCIATION 1 -----------------|
|-------------------------------------------------------|
|----------------Statistic (assoc level)----------------|
| [ID 7]: SCTP_STAT_SENT_CHUNKS, Count: 1|
| [ID 8]: SCTP_STAT_REC_CHUNKS, Count: 2655|
| [ID 9]: SCTP_STAT_OUT_OF_ORDER_SC, Count: 0|
| [ID 10]: SCTP_STAT_OUT_OF_ORDER_RC, Count: 0|
| [ID 12]: SCTP_STAT_RETRANS_CHUNKS, Count: 0|
| [ID 13]: SCTP_STAT_SENT_CC, Count: 12667|
| [ID 14]: SCTP_STAT_REC_CC, Count: 10015|
| [ID 15]: SCTP_STAT_FRAG_USER_MSG, Count: 0|
| [ID 16]: SCTP_STAT_REAS_USER_MSG, Count: 0|
| [ID 17]: SCTP_STAT_SENT_PACKAGES, Count: 12668|
| [ID 18]: SCTP_STAT_REC_PACKAGES, Count: 12668|
| [ID 19]: SCTP_STAT_COMM_STOP, Count: 0|
| [ID 20]: SCTP_STAT_COMM_RESUME, Count: 0|
| [ID 21]: SCTP_STAT_SENT_CHUNKS_DROPED, Count: 0|
| [ID 22]: SCTP_STAT_REC_CHUNKS_DROPED, Count: 0|
| Association ID: 1
sctphost_info -ep -all
$ sctphost_info -ep -all
sctphost_info - START.
|-------------------------------------------------------|
|----------------------- SCTP HOST ---------------------|
|RpuId: 17
|SctpInstId: 0
|Base State: BASE_RUN
|Host State: A|C|R|X|IA
|Ext. client: CONNECTED
|Alarm Timer: NOT RUNNING
|----------------- SCTP END POINT 1 --------------------|
|-------------------------------------------------------|
| localPort: 33333
| dscp: 24
| numOfLocalIp: 1
| localIpAddress 1: 10.62.5.22
| list of associations: 1
5-LTE-IP-Troubleshooting            .ppt

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5-LTE-IP-Troubleshooting .ppt

  • 2. Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 2 Agenda Upon completion of this chapter, the student will be able to: › Understand the E-UTRAN transport network › Understand the Ethernet connection of the DUL board › Configure the eNB transport MOs › Understand the transport network security of the eNB › Monitor the performance of the transport network › Understand how to dimension and plan the IP backhaul
  • 3. Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 3 OVERVIEW OF EPS S-GW S1-UP S1-CP S1-CP X2-CP eNodeB eNodeB MME S1-UP P-GW MME S5/S8 S10 S11 Internet X2-UP EPC E- UTRAN HSS S6a SGi PCRF Gx
  • 4. Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 4 ENODEB FUNCTIONALITY S-GW S1-UP S1-CP S1-CP X2-CP eNodeB eNodeB MME S1-UP P-GW MME S5/S8 S10 S11 X2-UP EPC E- UTRAN HSS S6a PCRF Gx -Terminates all user plane functions seen by the terminal (including security) -Radio Bearer control -Radio Admission control -Connection mobility control -UL/DL scheduling -IP header compression and encryption of user data streams -Measurement and measurement reporting configuration for mobility and scheduling
  • 5. Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 5 MME FUNCTIONALITY S-GW S1-UP S1-CP S1-CP X2-CP eNodeB eNodeB MME S1-UP P-GW MME S5/S8 S10 S11 X2-UP EPC E- UTRAN HSS S6a PCRF Gx -Authentication -NAS signaling -GW selection -Roaming (S6a to home HSS) -Bearer management -Idle mode tracking -Paging -Inter-MME and IRAT mobility -NAS Ciphering and Integrity Protection
  • 6. Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 6 SGW / PGW (CPG) FUNCTIONALITY S-GW S1-UP S1-CP S1-CP X2-CP eNodeB eNodeB MME S1-UP P-GW MME S5/S8 S10 S11 X2-UP EPC E- UTRAN HSS S6a PCRF Gx -In visited network in case of roaming -Intra-LTE mobility anchor -Packet routing & forwarding -Lawful intercept -LTE idle mode DL buffering -Charging per UE, PDN and QCI -Bearer findings for PMIP S5/S8 -Security for user data on S1 -External IP point of interconnect -IP address allocation -Packet routing & forwarding -Lawful intercept -Policy enforcement -In home or visited network
  • 7. Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 7 PCRF FUNCTIONALITY S-GW S1-UP S1-CP S1-CP X2-CP eNodeB eNodeB MME S1-UP P-GW MME S5/S8 S10 S11 X2-UP EPC E- UTRAN HSS S6a PCRF Gx -Provides Service Data Flow gating -Set QoS for each Service Data Flow -Define Charging for each Service Data Flow -Enables Bearer QoS Control -Correlation between Application and Bearer charging -Notification of bearer events to application function -Bearer findings towards SGW for PMIP based S5
  • 8. Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 8 HSS FUNCTIONALITY S-GW S1-UP S1-CP S1-CP X2-CP eNodeB eNodeB MME S1-UP P-GW MME S5/S8 S10 S11 X2-UP EPC E- UTRAN HSS S6a PCRF Gx -Maintain and provide subscription data -User identification handling -Access authorization -Provide Keys for authentication and encryption -User registration management -Maintain knowledge of used PDN GW
  • 9. Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 9 All ip MME Uu RRC PDCP RLC MAC S1AP SCTP PHY GTP-C UDP IP L1/L2 GTP-C UDP IP L1/L2 GTP-C UDP IP L1/L2 SGW PGW S1-MME S11 S5 NAS RRC PDCP RLC MAC S1AP SCTP NAS GTP-C UDP Uu SGW PGW S5 S1-U PDCP RLC MAC PDCP RLC MAC PHY GTP-U UDP IP L1/L2 GTP-U UDP IP L1/L2 GTP-U UDP IP L1/L2 GTP-U UDP IP L1/L2 L1/L2 Appl. IP PHY PHY Appl. IP eNodeB eNodeB IP L1/L2 IP L1/L2 IP L1/L2
  • 10. Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 10 latency and capacity R99 HSPA HSPA+ LTE 2005 2007 2009 2011 2003 150Mbps 28Mbps 14Mbps 384Kbps CAPACITY 150ms 100ms 50ms 10ms LATENCY
  • 11. Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 11 S1 Interface S1-AP Transport Network Layer GTP-U UDP IP Data link layer Physical layer User Plane PDUs SCTP IP Data link layer Physical layer Radio Network Layer Control Plane User Plane Transport Network User Plane Transport Network User Plane
  • 12. Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 12 X2 INTERFACE X2-AP Transport Network Layer GTP-U UDP IP Data link layer Physical layer User Plane PDUs SCTP IP Data link layer Physical layer Radio Network Layer Control Plane User Plane Transport Network User Plane Transport Network User Plane
  • 13. Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 13 DIGITAL UNIT for lte (DUL) › Prepared for high peak rates – 2x2 MIMO – 64QAM DL&UL › Capacity – Up to 1000 users – Up to 173Mbps DL throughput – Up to 56Mbps UL throughput › IP Transmission capability – All IP architecture with full-non blocking connectivity – 100/1000BASE-T – SFP slot for 1000BASE-X Timing function Loadable software DL & UL baseband processing IP traffic management Radio interface Transmission handling
  • 14. Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 14 IP/Ethernet connectivity DUL Step 2+ w/Removal of OAM Cable Fast Ethernet Port Network Processor GPM OAM, etc Internal Ethernet Switch LCT SoIP Baseband OAM LCT IP OAM IP Tagged VLANs on WAN port TN WAN if CP/UP IP Optionally separate SoIP IP Gigabit Ethernet Port
  • 15. Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 15 Transport nw configuration field- Slide title 40 pt lide subtitle 24 pt Text 24 pt -5 20 pt Created By OSS Created on site Created by Basic Package (formerly known as Basic CV) Created on site if SoIP is used SwManagement=1 IpSystem=1 Equipment=1 TransportNetwork=1 IpOam=1 ReliableProgramUn iter=”sctp” PiuType Subrack=1 Slot=1 PlugInUnit=1 GeneralProcessorUnit=1 Sctp Ip=1 IpRoutingTable EthernetLink (Aut. Created) ipAccessSctpRef Syncronization admActiveSlot rpuId IpAccessHostEt=1 Medium Access Unit activeMau ExchangeTerminalIp=1 GigabitEthernet=1 IpInterface=2 ipInterfaceMoRef IpAccessSctp=1 ipAccessHostEtRef1 IpSyncRef=1 IPHostLink ipInterfaceMoRef TimingUnit=1 (LCT port OAM IP interface) (GE port OAM IP interface link) IpInterface=1 (Note: Two IPInterface MOs if IPAccessHostEt and IPHostLink shall use different VLANs.) Created by on site if SoIP is used, otherwise created by OSS,
  • 16. Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 16 SITE CONFIGURATION
  • 17. Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 17 Transport sharing
  • 18. Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 18 MPBN/IPRAN
  • 19. Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 19 SECURITY DOMAINS S-GW eNodeB MME P-GW Internet HSS Trusted Untrusted RRC integrity & ciphering NAS signalling integrity & ciphering User Plane in Uu ciphering IPSEC integrity & ciphering
  • 20. Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 20 Key hierarchy in e-utran USIM / AuC UE / MME KASME K UPenc KeNB / NH KNASint UE / HSS UE / eNB KNASenc CK, IK K RRCint K RRCenc K
  • 21. Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 21 Transport network security Sender Receiver SeGW SeGW A to B X to Y A to B Inner IP address A Outer IP address X Outer IP address Y Inner IP address B A to B ESP tunnel Packet transport in tunnel mode as in RFC4301 eNB eNB host application Core network node SeGW function in CPP Core Network SeGW A to B X to Y A to B Inner IP address A Outer IP address X Outer IP address Y Inner IP address B A to B ESP tunnel Packet transport in tunnel mode in eNodeB
  • 22. Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 22 IPSEC in LTE (L10B) › Ipsec protection will be available for CN traffic between eNBs and SeGWs in the network. › O&M traffic is still protected by application level security when the RBS runs in security level 3. › It is optional whether SoIP traffic should be IPsec protected or only bypassed. This is chosen via configuration. eNB_1 SEG_1 HeNB_1 SEG_EPC MME_1 HMME_1 MME_N HMME_N SGw_1 HSGw_1 SGw_M HSGw_M eNB_2 SEG_2 HeNB_2 R EPeNB_2 EPeNB_1 EPEPC Private network X Private network X Private network X IPsec tunnel (used for S1 and X2) FW OSS OSS services OSS traffic not IPsec protected. (Secure application layer protocols are used.)
  • 23. Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 23 Preliminar IPSEC mom view(TBD) IpInterface MO VpnInterface MO IpAccessHostEt MO (representing internal IP adr) IpAccessHostEt MO (representing external IP adr) IpSecTunnel MO AccessControlList MO IPSec MO IkePeer MO Definies the outer subnet address Defines the inner subnet address Represents the inner IP address of the node 1 * 1 * 1 * 1 * 0..1 0..1 1 * 0..1 * 0..1 0..1 Represents the outer IP address of the node
  • 24. Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 24 L10b ipsec simplifications › Only ESP in tunnel mode will be implemented. The optional AH will not be supported. › The following security features of ESP will be supported – Confidentiality – Integrity service – Data origin authentication – Anti-replay protection ESP ALGORITHMS IKEv2 ALGORITHMS Ciphering algorithms - ESP_NULL - ESP_3DES in CBC mode (168) - AES in CBC mode (128 & 256) Ciphering algorithms - ESP_NULL - ESP_3DES in CBC mode (168) - AES in CBC mode (128 & 256) Integrity algorithms - ESP_HMAC_MD5 (128) - ESP_HMAC_SHA-1 (160) Integrity algorithms - HMAC_SHA-1-96 (128 & 256) Pseudo-random functions - HMAC_SHA-1 (160) IKE authentication - RSA (1024 & 2048) - PSK (128 & 256)
  • 25. Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 25 BACKHAUL RECOMMENDATIONS Property Description Bandwidth Peak rates of 170 Mbps in the last mile, equivalent to the peak rate of a 1-sector LTE 20 MHz 2x2 MIMO RBS and 100 Mbps for a 3-sector RBS. Synchronization Better than 50 parts per billion. Delay Maximum backhaul delay 50-70 ms Delay variation No requirements on delay variation other than those required when NTPsystem is chosen for frequency synchronization. Packet loss No requirements for packet loss ratio on the backhaul. Packet size Maximum packet size is 1360B. In case of Ethernet Jumbo frame support the maximum packet size is 1640B Lock Time Gaussian PDV% of Packets 16 min 1% packets < 20us during 2h or 99% < 0.3ms 60 min 99% < 3ms 180 min 99% < 10ms
  • 26. Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 26 Services qos QCI Resource Type Priority Packet Delay Budget (NOTE 1) Packet Error Loss Rate (NOTE 2) Example Services 1 2 100 ms 10 -2 Conversational Voice 2 GBR 4 150 ms 10 -3 Conversational Video (Live Streaming) 3 3 50 ms 10 -3 Real Time Gaming 4 5 300 ms 10 -6 Non-Conversational Video (Buffered Streaming) 5 1 100 ms 10 -6 IMS Signalling 6 6 300 ms 10 -6 Video (Buffered Streaming) TCP-based (e.g., www, e-mail, chat, ftp, p2p file sharing, progressive video, etc.) 7 Non-GBR 7 100 ms 10 -3 Voice, Video (Live Streaming) Interactive Gaming 8 8 300 ms 10 -6 Video (Buffered Streaming) TCP-based (e.g., www, e-mail, chat, ftp, p2p file 9 9 sharing, progressive video, etc.)
  • 27. Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 27 Bandwidth dimensioning › Dimensioning the Last mile – Based on the cell peak rate, limited by › Hardware capacity › Licensed capacity for the DL baseband throughput – Transmission and protocol overhead is considered › Dimensioning the IP RAN backhaul – Inputs: › Average cell throughput during busy hour › Cell peak rate › Cell throughput in a loaded network › eNB throughput in a loaded network › eNB throughput during busy hour › Transport overhead – Output:
  • 28. Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 28 Observability Property Plane How to monitor Congestion User Plane Upper layer protocols such as TCP Control Plane Number of SCTP retransmissions (Sctp::pmSctpStatRetransChunks) Traffic Volume Total (S1, X2, Mul) DL Traffic: GigabitEthernet::pmIfInOctetsLink1Hi & pmIfInOctetsLinkLo UL Traffic: GigabitEthernet::pmIfOutOctetsLink1Hi & pmIfOutOctetsLink1Lo User Plane (S1, X2) DL Traffic: IpAccessHostEt::pmUdpInDatagrams UL Traffic: IpAccessHostEt::pmUdpOutDatagrams Control Plane (S1, X2) Sctp::pmSctpStatSentChunks & pmSctpStatRecChunks & pmSctpStatRetransChunks UP + CP (S1, X2) IpInterface::pmDot1qTpVlanPortInFrames & pmDot1qTpVlanPortOutFrames IpInterface::pmIfStatsIpInReceives & pmIfStatsIpOutRequests IpAccessHostEt::pmIpInReceives & pmIpOutRequests Delay & Jitter SoIP Synchronization::pmHDelayVarBest1Pct & pmHDelayVarBest10Pct & pmHDelayVarBest50Pct Synchronization::pmMaxDelayVariation Packet Loss User Plane Upper layers such as TCP Control Plane Sctp::pmSctpStatRetransChunks & pmSctpStatSentChunks
  • 29. Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 29 OBSERVABILITY IN THE FUTURE (TBD) › New SCTP counters shall specify SCTP traffic-related and stated-related statistics about each SCTP association. › New GTP counters specify GTP-U traffic-related statistics about the GTP-U host (also known as GTP-U endpoint) › New IP counters specify additional traffic-related statistics about each IPv4/IPv6 interface including total, multicast, broadcast and Diffserv codepoint (DSCP) usage statistics. › Extend the current ICMPv4 counters for the IP traffic host to support the equivalent ICMPv6 messages
  • 30. Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 30 IP Transport counters EtHostMo_getPmCounters -h 1 -t 1 100212-10:35:17 10.62.4.22 7.1y ERBS_NODE_MODEL_A_9_2_COMPLETE stopfile=/tmp/54 $ EtHostMo_getPmCounters -h 1 -t 1 PM counters for host with hostFroId 1 ipAddrErrors=0 ipInDelivers=384399 ipInDiscards=-2 ipInHdrErrors=0 ipInReceivedOctets=-2 ipInReceives=161317 ipInUnknownProtos=0 ipNumFailedAt=-2 ipOutDiscards=-2 ipOutRequests=533274 ipOutRequestOctets=-2 ipReasmReqds=0 ipReasmOKs=0 ipReasmFails=0 ipFragOKs=0 ipFragFails=0 ipFragCreates=0 ipPortUnreachable=0 udpInDatagrams=0 udpInErrors=0 udpNoPorts=-2 udpOutDatagrams=0 icmpInDestUnreachs=0 icmpInEchoReps=0 icmpInEchos=0 icmpInErrors=0 icmpInMsgs=0 icmpInParamProbs=0 icmpInRedirects=0 icmpInSrcQuenchs=0 icmpInTimeExcds=0 icmpOutDestUnreachs=0 icmpOutEchoReps=0 icmpOutEchos=0 icmpOutErrors=-2 icmpOutMsgs=0 icmpOutParamProbs=-2 EtHostMo_getPmCounters EtHostMo_getPmCounters -h <hostFroId> -t <typeOfCounters> ..where.. EtHostMo_getPmCounters is mandatory and name of the COLI command -h <hostFroId> is mandatory -t <typeOfCounters> is mandatory, possible values: 1 - all PM counters 2 - ip PM counters 3 - icmp PM counters 4 - udp PM counters Example: EtHostMo_getPmCounters -h 1 -t 1
  • 31. Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 31 IP connectivity EtHostMo_startPing EtHostMo_startPing -d <destIpAddr> -h <hostFroId> -c <noPings> -s <pktSize> ..where.. EtHostMo_startPing is mandatory and name of the COLI command -d <destIpAddr> is mandatory (dotted decimal notation) -h <hostFroId> is mandatory (integer > 0) -c <noPings> is optional (default value 4) -s <pktSize> is optional (default value 56 byte ICMP payload) Example: EtHostMo_startPing -d 192.168.1.2 -h 1 -c 25 -s 18 EtHostMo_stopPing EtHostMo_stopPing -d <destIpAddr> -h <hostFroId> ..where.. EtHostMo_stopPing is mandatory and name of the COLI command -d <destIpAddr> is mandatory (dotted decimal notation) -h <hostFroId> is mandatory (integer > 0) Example: EtHostMo_stopPing -d 192.168.1.2 -h 1
  • 32. Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 32 IP CONNECTIVITY EtHostMo_startTraceRoute EtHostMo_startTraceRoute -d <destIpAddr> -h <hostFroId> -q <nQueries> -s <pktSize> -f <firstHop> -m <maxHop> -w <waitTime> ..where.. EtHostMo_startTraceRoute is mandatory and name of the COLI command -d <destIpAddr> is mandatory (dotted decimal notation) -h <hostFroId> is mandatory (integer > 0) -q <nQueries> is optional (default value 4) -s <pktSize> is optional (default value 56 byte ICMP payload) -f <firstHop> is optional (default value 1) -m <maxHop> is optional (default value 40) -w <waitTime> is optional (default value 5) Example: EtHostMo_startTraceRoute -d 192.168.1.2 -h 1 -q 5 -s 18 -f 3 -m 60 -w 3
  • 33. Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 33 O&M capture Dumpcap dumpcap started on le0 Dump is stored in 000100!/d/logfiles/sniffer/default/eth.cap Total size of capture files are limited to 10000000 Bytes. Tracing will be automaticaly stoped after 900 seconds Warning: Capacity for OAM/communication is reduced while dumpcap is tracing. Pcapexplorer Lists dumpcap traces. Traces can be deleted with the -d option $ pcapexplorer dumpcap traces stored in 000100!/d/logfiles/sniffer/ NAME: SIZE: CREATED: LAST-TRACE: ===== ===== ======== =========== default 426136 2010-02-12 09:53.54 2010-02-12 09:53.54 QUOTA: 10000000 TOTALT USED: 426136
  • 34. Ericsson AB 2010 | IP Troubleshooting for LTE | LZU 102 1894 Uen | March 2010 | Page 34 Sctp coLI sctphost_stat -assoc -all $ sctphost_stat -assoc -all sctphost_stat - START. |-------------------------------------------------------| |----------------------- SCTP HOST ---------------------| |RpuId: 17 |SctpInstId: 0 |Base State: BASE_RUN |Host State: A|C|R|X|IA |Ext. client: CONNECTED |Alarm Timer: NOT RUNNING |---------------- SCTP ASSOCIATION 1 -----------------| |-------------------------------------------------------| |----------------Statistic (assoc level)----------------| | [ID 7]: SCTP_STAT_SENT_CHUNKS, Count: 1| | [ID 8]: SCTP_STAT_REC_CHUNKS, Count: 2655| | [ID 9]: SCTP_STAT_OUT_OF_ORDER_SC, Count: 0| | [ID 10]: SCTP_STAT_OUT_OF_ORDER_RC, Count: 0| | [ID 12]: SCTP_STAT_RETRANS_CHUNKS, Count: 0| | [ID 13]: SCTP_STAT_SENT_CC, Count: 12667| | [ID 14]: SCTP_STAT_REC_CC, Count: 10015| | [ID 15]: SCTP_STAT_FRAG_USER_MSG, Count: 0| | [ID 16]: SCTP_STAT_REAS_USER_MSG, Count: 0| | [ID 17]: SCTP_STAT_SENT_PACKAGES, Count: 12668| | [ID 18]: SCTP_STAT_REC_PACKAGES, Count: 12668| | [ID 19]: SCTP_STAT_COMM_STOP, Count: 0| | [ID 20]: SCTP_STAT_COMM_RESUME, Count: 0| | [ID 21]: SCTP_STAT_SENT_CHUNKS_DROPED, Count: 0| | [ID 22]: SCTP_STAT_REC_CHUNKS_DROPED, Count: 0| | Association ID: 1 sctphost_info -ep -all $ sctphost_info -ep -all sctphost_info - START. |-------------------------------------------------------| |----------------------- SCTP HOST ---------------------| |RpuId: 17 |SctpInstId: 0 |Base State: BASE_RUN |Host State: A|C|R|X|IA |Ext. client: CONNECTED |Alarm Timer: NOT RUNNING |----------------- SCTP END POINT 1 --------------------| |-------------------------------------------------------| | localPort: 33333 | dscp: 24 | numOfLocalIp: 1 | localIpAddress 1: 10.62.5.22 | list of associations: 1

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