MPLS Architechture
LDP Overview

• All LSR must run LDP and exchange label
bindings
• Label operation ( swap, push, pop ) is
known to each LS...
Basic MPLS LDP Configuration
!
hostname london
!
Ip cef
!
mpls ldp router-id Loopback0 force
mpls label protocol ldp
!
Int...
LDP Session Establishment and Maintanance

LDP session parameters:
- Timer values
- Label distribution method
- VPI(Virtua...
LDP Hello Message
Changing the default Ldp transport address
!
hostname new york
!
interface ethernet1/1
ip address 10.200.210.1 255.255.255...
Number of LDP Sessions
Advertising of Label Mapping

• Unsolicited Downstream(UD) versus
Downstream on Demand(DoD)
advertisement mode
• Liberal L...
Example of a LIB
London# show mpls ldp bindings
lib entry: 10.200.210.0/24, rev 4
local binding: label: imp-null
remote bi...
Example of a LIB
London# show mpls ldp bindings
lib entry: 10.200.210.0/24, rev 4
local binding: label: imp-null
remote bi...
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Mpls architechture

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Mpls architechture

  1. 1. MPLS Architechture
  2. 2. LDP Overview • All LSR must run LDP and exchange label bindings • Label operation ( swap, push, pop ) is known to each LSR by looking into LFIB • LIB is fed by label bindings received by LDP, RSVP, MP-BGP or statically assign label binding. • LDP peers exchange label mapping message across LDP session.
  3. 3. Basic MPLS LDP Configuration ! hostname london ! Ip cef ! mpls ldp router-id Loopback0 force mpls label protocol ldp ! Interface loopback0 ip address 10.200.254.2 255.255.255.255 ! Interface Ethernet0/1/3 ip address 10.200.210.2 255.255.255.0 mpls ip !
  4. 4. LDP Session Establishment and Maintanance LDP session parameters: - Timer values - Label distribution method - VPI(Virtual Path Identifier)/VCI(Virtual Channel Identifier) range for LC-ATM - Data-link connection identifier range for LC-Frame-Relay
  5. 5. LDP Hello Message
  6. 6. Changing the default Ldp transport address ! hostname new york ! interface ethernet1/1 ip address 10.200.210.1 255.255.255.0 mpls ldp discovery transport-address 10.200.255.1 mpls ip ! interface ethernet1/2 ip address 10.200.218.1 255.255.255.0 mpls ldp discovery transport-address 10.200.255.1 mpls ip !
  7. 7. Number of LDP Sessions
  8. 8. Advertising of Label Mapping • Unsolicited Downstream(UD) versus Downstream on Demand(DoD) advertisement mode • Liberal Label Retention(LLR) versus Conservative Label Retention(CLR) mode • Independent LSP Control versus Ordered LSP Control mode
  9. 9. Example of a LIB London# show mpls ldp bindings lib entry: 10.200.210.0/24, rev 4 local binding: label: imp-null remote binding: lsr: 10.200.254.5:0, label: 16 remote binding: lsr: 10.200.254.1:0, label: imp-null remote binding: lsr: 10.200.254.3:0, label: 19 lib entry: 10.200.211.0/24, rev 12 local binding: label: imp-null remote binding: lsr: 10.200.254.5:0, label: 18 remote binding: lsr: 10.200.254.1:0, label: 32 remote binding: lsr: 10.200.254.3:0, label:imp-null lib entry: 10.200.254.1/32, rev 31 local binding: label: 24 remote binding: lsr: 10.200.254.5:0, label: 22 remote binding: lsr: 10.200.254.1:0, label: imp-null remote binding: lsr: 10.200.254.3:0, label: 26
  10. 10. Example of a LIB London# show mpls ldp bindings lib entry: 10.200.210.0/24, rev 4 local binding: label: imp-null remote binding: lsr: 10.200.254.5:0, label: 16 remote binding: lsr: 10.200.254.1:0, label: imp-null remote binding: lsr: 10.200.254.3:0, label: 19 lib entry: 10.200.211.0/24, rev 12 local binding: label: imp-null remote binding: lsr: 10.200.254.5:0, label: 18 remote binding: lsr: 10.200.254.1:0, label: 32 remote binding: lsr: 10.200.254.3:0, label:imp-null lib entry: 10.200.254.1/32, rev 31 local binding: label: 24 remote binding: lsr: 10.200.254.5:0, label: 22 remote binding: lsr: 10.200.254.1:0, label: imp-null remote binding: lsr: 10.200.254.3:0, label: 26
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