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Mar 14 2011   1:00AM GMT

MPLS Pseudo-Wire Basics – Part 4

Joshua Wood Joshua Wood Profile: Joshua Wood

Hello all, now that we have the design, CE and PE pieces outlined let’s go over the P or provider core routers. This is really straight forward because the core routers are essentially only receiving, re-tagging and sending the traffic out again. There is more to it than that of course but you don’t have the complexity of the PE routers that receive the traffic and tag it with MPLS data and then forward it on. The P routers are essentially only routing channels. Below are the configs for the P routers as shown in my original design (link below).

As a side note here that I will try to remember to reiterate when I do the final piece to this series, you can use a layer 2 switch in between the various devices as long as the MTU of the switches is high enough to allow for the oversized MPLS packets to pass through it. I recommend you use 1600 or greater for the MTU setting on the switches. This gives you some nice flexibility if you need to run your connection over a layer 2 switch to extend a cable length or connect two sites but don’t want to put another router in between.

P1#sh run
ip source-route
ip cef
!
interface Loopback0
description OSPF LOOPBACK
ip address 10.1.1.1 255.255.255.255
!
interface GigabitEthernet0/0
description CONNECT TO P2
ip address 192.168.2.1 255.255.255.0
duplex auto
speed auto
mpls ip
!
interface GigabitEthernet0/1
description CONNECT TO P3
ip address 192.168.4.1 255.255.255.0
duplex auto
speed auto
mpls ip
!
interface GigabitEthernet0/2
description CONNECT TO PE1
ip address 172.16.1.1 255.255.255.0
duplex auto
speed auto
mpls ip
!
router ospf 101
router-id 10.1.1.1
log-adjacency-changes
network 10.1.1.1 0.0.0.0 area 0
network 172.16.1.0 0.0.0.255 area 0
network 192.168.2.0 0.0.0.255 area 0
network 192.168.4.0 0.0.0.255 area 0
!
P1#

P3#sh run
ip source-route
ip cef
!
interface Loopback0
description OSPF LOOPBACK
ip address 10.1.2.1 255.255.255.255
!
interface GigabitEthernet0/0
description CONNECT TO P1
ip address 192.168.2.2 255.255.255.0
duplex auto
speed auto
mpls ip
!
interface GigabitEthernet0/1
description CONNECT TO P2
ip address 192.168.4.2 255.255.255.0
duplex auto
speed auto
mpls ip
!
interface GigabitEthernet0/2
description CONNECT TO PE2
ip address 172.16.3.1 255.255.255.0
duplex auto
speed auto
mpls ip
!
router ospf 101
router-id 10.1.3.1
log-adjacency-changes
network 10.1.2.1 0.0.0.0 area 0
network 172.16.2.0 0.0.0.255 area 0
network 172.16.3.0 0.0.0.255 area 0
network 192.168.2.0 0.0.0.255 area 0
network 192.168.3.0 0.0.0.255 area 0
network 192.168.4.0 0.0.0.255 area 0
!
P3#

MPLS Pseudo-wire Basics Part 1: http://itknowledgeexchange.techtarget.com/techstop/mpls-pseudo-wire-basics/

Until next time,
TechStop

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