Cisco CCNA IP SLA with tracking configuration

CISCO CCNA
IP SLA withTracking Configuration
To watch our Cisco CCNA Video Trainings Please Check out the link below:
www.asmed.com/c1
ASM Educational Center Inc. (ASM)
Where Training, Technology & Service Converge
Phone: (301) 984-7400
Rockville,MD

Now we will do Lab for Tracking
In here we have as follow
Above we have a router (R1) that is connected to two ISPs. We want to use ISP1 as the primary and
ISP2 as the backup link. All traffic will be sent towards ISP1 but when it’s unreachable we’ll switch
over to ISP2. You can achieve this by using two default routes:
R1=f0/0 192.168.12.1 /24 connected to ISP1=192.168.12.2
R1=F0/1 192.168.13.1 /24 connected to ISP2= 192.168.13.3
R1#show ip int brief

Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 192.168.12.1 YES manual up up
Serial0/1/0 unassigned YES Unset administratively down down

R1(config)#ip route 0.0.0.0 0.0.0.0 192.168.12.2
R1(config)#ip route 0.0.0.0 0.0.0.0 192.168.13.3 50
As we see in above we are using the floating Static route that is top one has
AD=1 for static route and 2nd one the AD=50 , so when I go to
R1#show ip route

I will see the top commands on the routing tables
R1#show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is 192.168.12.2 to network 0.0.0.0
C 192.168.12.0/24 is directly connected, FastEthernet0/0
S* 0.0.0.0/0 [1/0] via 192.168.12.2
R1#

Here R1 can ping both ISP and from above we see it prefer top ISP1
R1#ping 192.168.12.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.12.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms
R1#
R1#ping 192.168.13.3
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.13.3, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/4 ms
R1#

R1#show cdp neighbors
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone,
D - Remote, C - CVTA, M - Two-port Mac Relay
Device ID Local Intrfce Holdtme Capability Platform Port ID
ISP2 Fas 1/0 136 R 7206VXR Fas 1/0
ISP1 Fas 0/0 143 R 7206VXR Fas 0/0

Now If I go to R1 and shut down the f0/0 (which is connected to ISP1) then since I have the
Floating point the R1 #show ip route will be pointed to ISP2
R1#config t
Enter configuration commands, one per line. End with CNTL/Z.
R1(config)#int f0/0
R1(config-if)#shut

R1#show ip route
S* 0.0.0.0/0 [50/0] via 192.168.13.3
R1#

As we see in above now R1 goes to internet via ISP2 , which is called the floating point----
But what happen if the link on ISP1 goes than ; then R1 in his table still will have original route to ISP1=192.168.12.2
so in here we will use the concept of Ip SLA with adding the track on the static route of R1

Lets bring up the int f0/0 on r1;
R1#config t
R1(config)#int f0/0
R1(config-if)#no shut

R1#show ip int brief
Serial0/1/0 unassigned YES Unset administratively down down

R1#
R1#
R1#show ip rou
R1#show ip route
S* 0.0.0.0/0 [1/0] via 192.168.12.2
R1#

Now life is back to normal, that is using ISP1=192.168.12.2
Now we will do tracking with Ip SLA
Step 1) I will create an IP SLA instance that pings the IP address of the ISP1
router:
R1(config)#ip sla 1
R1(config-ip-sla)#

R1(config-ip-sla)#?
IP SLAs entry configuration commands:
dhcp DHCP Operation
dns DNS Query Operation
ethernet Ethernet Operations
exit Exit Operation Configuration
frame-relay Frame-relay Operation
ftp FTP Operation
http HTTP Operation
icmp-echo ICMP Echo Operation
icmp-jitter ICMP Jitter Operation
path-echo Path Discovered ICMP Echo Operation
path-jitter Path Discovered ICMP Jitter Operation
tcp-connect TCP Connect Operation
udp-echo UDP Echo Operation
udp-jitter UDP Jitter Operation
voip Voice Over IP Operation

Now we will use the same concept as before that is icmp-echo
R1(config-ip-sla)#icmp-echo 192.168.12.2 ( Point to ISP1=192.168.12.2)
R1(config-ip-sla-echo)#
R1(config-ip-sla-echo)#?
IP SLAs echo Configuration Commands:
default Set a command to its defaults
exit Exit operation configuration
frequency Frequency of an operation
history History and Distribution Data
no Negate a command or set its defaults
owner Owner of Entry
request-data-size Request data size

tag User defined tag
threshold Operation threshold in milliseconds
timeout Timeout of an operation
tos Type Of Service
verify-data Verify data
vrf Configure IP SLAs for a VPN Routing/Forwarding instance
R1(config-ip-sla-echo)#frequency ?
<1-604800> Frequency in seconds (default 60)
R1(config-ip-sla-echo)#frequency 20 ?
<cr>
R1(config-ip-sla-echo)#frequency 20

Here is show run so far
R1#show run
ip sla 1
icmp-echo 192.168.12.2
frequency 20

Step 2) Go back to global configuration to schedule now for forever
R1#
R1#config t
R1(config)#ip sla
R1(config)#ip sla ?
<1-2147483647> Entry Number

enable Enable Event Notifications
ethernet-monitor IP SLAs Auto Ethernet configuration
group Group Configuration or Group Scheduling
key-chain Use MD5 authentication for IP SLAs Control Messages
logging Enable Syslog
low-memory Configure Low Water Memory Mark
reaction-configuration IP SLAs Reaction-Configuration
reaction-trigger IP SLAs Trigger Assignment
reset IP SLAs Reset
responder Enable IP SLAs Responder
restart Restart An Active Entry
schedule IP SLAs Entry Scheduling

R1(config)#ip sla schedule ?
<1-2147483647> Entry number
R1(config)#ip sla schedule 1 ?
ageout How long to keep this Entry when inactive
life Length of time to execute in seconds
recurring Probe to be scheduled automatically every day
start-time When to start this entry
<cr>

R1(config)#ip sla schedule 1 sta
R1(config)#ip sla schedule 1 start-time ?
after Start after a certain amount of time from now
hh:mm Start time (hh:mm)
hh:mm:ss Start time (hh:mm:ss)
now Start now
pending Start pending

R1(config)#ip sla schedule 1 start-time now ?
life Length of time to execute in seconds
<cr>
R1(config)#ip sla schedule 1 start-time now li
R1(config)#ip sla schedule 1 start-time now life ?
<0-2147483647> Life seconds (default 3600)
forever continue running forever

R1(config)#ip sla schedule 1 start-time now life for
R1(config)#ip sla schedule 1 start-time now life forever ?
<cr>
R1(config)#ip sla schedule 1 start-time now life forever
R1(config)#

R1#show run
ip sla 1
icmp-echo 192.168.12.2
frequency 20
ip sla schedule 1 life forever start-time now

let’s check with show commands
life is good now
R1#show ip sla sta
R1#show ip sla statistics
IPSLAs Latest Operation Statistics
IPSLA operation id: 1
Type of operation: icmp-echo
Latest RTT: 1 milliseconds
Latest operation start time: *05:40:17.723 UTC Thu Dec 15 2016
Latest operation return code: OK
Number of successes: 6
Number of failures: 1
Operation time to live: Forever

Step 3) now I will define the track number; and then later on I will append it to default route
pointed to ISP1=192.168.12.2
R1#
R1#
R1#config t
R1(config)#trac
R1(config)#track 1 ?
interface Select an interface to track
ip IP protocol
list Group objects in a list
stub-object Stub tracking object

R1(config)#track 1 ip ?
route IP route
sla IP Service Level Agreement
R1(config)#track 1 ip sla ?
<1-2147483647> Entry number
R1(config)#track 1 ip sla 1 ?
reachability Reachability
state Return code state
<cr>

R1(config)#track 1 ip sla 1 re
R1(config)#track 1 ip sla 1 reachability ?
<cr>
R1(config)#track 1 ip sla 1 reachability
R1(config-track)#

track 1 ip sla 1 reachability
ip route 0.0.0.0 0.0.0.0 192.168.12.2
ip route 0.0.0.0 0.0.0.0 192.168.13.3 50
!
!
!
ip sla 1
icmp-echo 192.168.12.2
frequency 20

Step 4) now I go to default router that I had; remove it and add it with new track number 1
R1#config t
R1(config)#no ip route 0.0.0.0 0.0.0.0 192.168.12.2
R1(config)#ip route 0.0.0.0 0.0.0.0 192.168.12.2 ?
<1-255> Distance metric for this route
name Specify name of the next hop
permanent permanent route
tag Set tag for this route
track Install route depending on tracked item
<cr>
R1(config)#ip route 0.0.0.0 0.0.0.0 192.168.12.2 tr
R1(config)#ip route 0.0.0.0 0.0.0.0 192.168.12.2 track ?
<1-500> tracked object number

R1(config)#ip route 0.0.0.0 0.0.0.0 192.168.12.2 track 1 ?
<1-255> Distance metric for this route
name Specify name of the next hop
tag Set tag for this route
<cr>
R1(config)#ip route 0.0.0.0 0.0.0.0 192.168.12.2 track 1

So here is show run so far:
r1#show run
!track 1 ip sla 1 reachability
!
interface FastEthernet0/0
ip address 192.168.12.1 255.255.255.0
duplex auto
speed auto
!
ip address 192.168.13.1 255.255.255.0
duplex auto
speed auto
!

!
ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 192.168.12.2 track 1 ( here I have added the Track)
ip route 0.0.0.0 0.0.0.0 192.168.13.3 50
!
!
!
ip sla 1
icmp-echo 192.168.12.2 ( this is IP address of Main ISP1 that I am looking )
frequency 20
!

Now we will test it
That is if ISP1=f0/0=192.168.12.2 goes down ; then when I go to R1#show ip route I will see the routing table
has been changed to the new one
ISP1#show ip int brief
FastEthernet1/0 unassigned YES NVRAM administratively down down

ISP1#config t
ISP1(config)#int f0/0
ISP1(config-if)#shut
ISP1(config-if)#

Now I will go to R1#show ip route and see the routing table should point to ISP2=192.168.13.3
R1#show ip route
S* 0.0.0.0/0 [50/0] via 192.168.13.3
R1#

Which it did with AD=50
Now let’s look at some show commands it shows it changed
Latest RTT: NoConnection/Busy/Timeout
Latest operation return code: No connection (here says no connection)
Number of failures: 5 ( here is number changing)

Latest operation return code: No connection
Number of failures: 7 ( here is the number changes)

R1#
Latest operation return code: No connection

R1#
R1#show ip route
S* 0.0.0.0/0 [50/0] via 192.168.13.3
R1#

Now I go back to ISP1 and bring back online
ISP1#show ip int brief

ISP1#config t
ISP1(config)#int f0/0
ISP1(config-if)#no shut
ISP1(config-if)#

Now I go back to R1#show ip route and check the work
R1#show ip route
S* 0.0.0.0/0 [1/0] via 192.168.12.2

Life is back to normal

So summary on R1 show run
R1#show run
!
track 1 ip sla 1 reachability ( track 1 is pointed to default route)
!
!
!
ip address 192.168.12.1 255.255.255.0
duplex auto
speed auto

!
ip address 192.168.13.1 255.255.255.0
duplex auto
speed auto
!

!
ip forward-protocol nd
ip route 0.0.0.0 0.0.0.0 192.168.12.2 track 1 ( here we are tracking 1)
ip route 0.0.0.0 0.0.0.0 192.168.13.3 50 ( this is 2ndary static route since it has AD=50)
!
!
!
ip sla 1
icmp-echo 192.168.12.2 ( this is pointed to Main ISP1 =primary)
frequency 20

ASM Educational Center Inc. (ASM)
Where Training, Technology & Service Converge
To watch our CiscoCCNAVideoTrainings PleaseCheck out the link below:
www.asmed.com/c1
Phone: (301) 984-7400
Rockville,MD

Cisco CCNA IP SLA with tracking configuration

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