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Archive for September, 2012|Monthly archive page

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IOS XR – VRF lite and dot1q Trunks

In CCIE, How To, IOS XR on September 28, 2012 at 08:54

Ok, time for some VRF lite basics and we can throw in some Dot1Q trunks to go with it.

First, let’s create our VRF called LAB
RP/0/7/CPU0:R1(config)#vrf LAB

Now we need to enable the address family for this VRF, there IPv4 Unicast
RP/0/7/CPU0:R1(config-vrf)#address-family ipv4 un
RP/0/7/CPU0:R1(config-vrf-af)#exit

Now we need to enable the IPv6 address family for this VRF
RP/0/7/CPU0:R1(config-vrf)#address-family ipv6 unicast

Now we can create our Dot1Q trunk to the other router:
RP/0/7/CPU0:R1(config-vrf-af)#int g0/3/0/3.100

Little different then IOS, but this actually makes more sense
RP/0/7/CPU0:R1(config-subif)#dot1q vlan 100
RP/0/7/CPU0:R1(config-subif)#ip add 150.1.21.1/24
RP/0/7/CPU0:R1(config-subif)#ipv6 add 2001:1:1:21::1/64
RP/0/7/CPU0:R1(config-subif)#vrf LAB

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IOS XR – Route Filtering

In CCIE, How To, IOS XR on September 27, 2012 at 08:33

 

 

Ok, now that BGP has been covered, lets talk about filtering routes received from our neighbor.  Here I have created some additional Loopbacks on R2 that are being advertised to R1:

RP/0/7/CPU0:R1#sh ip route bgp
Fri Mar 30 13:13:36.797 UTC

B    200.100.200.100/32 [20/0] via 2.2.2.2, 00:00:42
B    200.200.200.200/32 [20/0] via 2.2.2.2, 13:45:00
B    200.200.200.203/32 [20/0] via 2.2.2.2, 00:00:42
B    200.200.200.204/32 [20/0] via 2.2.2.2, 00:00:42
B    200.200.200.205/32 [20/0] via 2.2.2.2, 00:00:42
B    200.200.200.206/32 [20/0] via 2.2.2.2, 00:00:42
B    200.200.200.207/32 [20/0] via 2.2.2.2, 00:00:42
B    200.200.200.208/32 [20/0] via 2.2.2.2, 00:00:42
B    200.200.200.209/32 [20/0] via 2.2.2.2, 00:00:42
B    200.200.200.210/32 [20/0] via 2.2.2.2, 00:00:42
RP/0/7/CPU0:R1#

As you can see, we are getting a bunch of 200.200.200.x/32 routes now as well as a 200.100.200.100/32 route.  For this exercise, lets filter our all the 200.200.200.x routes we are receiving from our neighbor.

Ok, lets create a prefix-set for the loopback we want to permit:

RP/0/7/CPU0:R1(config)#conf t
RP/0/7/CPU0:R1(config)#prefix-set R2Loopbacks

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IOS XR – iBGP and eBGP

In CCIE, IOS, IOS XR on September 24, 2012 at 08:25

BGP, this is where it starts to get different with IOS XR.
First up, configuring an iBGP peering with R2’s 150.1.12.2 in AS1 and advertise our loopback interface.

RP/0/7/CPU0:R1(config)#
RP/0/7/CPU0:R1(config)#router bgp 1

Let’s define the network we want to advertise, under the address family:
RP/0/7/CPU0:R1(config-bgp)#address-family ipv4 unicast
RP/0/7/CPU0:R1(config-bgp-af)#net 1.1.1.1/32
RP/0/7/CPU0:R1(config-bgp-af)#exit

Now, we can configure the neighbor.  Notice all the commands for the neighbor are under the neighbor now – not next to the neighbor.
RP/0/7/CPU0:R1(config-bgp)#nei 150.1.12.2
RP/0/7/CPU0:R1(config-bgp-nbr)#remote-as 1
RP/0/7/CPU0:R1(config-bgp-nbr)#address-family ipv4 unicast
RP/0/7/CPU0:R1(config-bgp-nbr-af)#exit
RP/0/7/CPU0:R1(config-bgp-nbr)#comm
Thu Mar 29 22:47:05.147 UTC

RP/0/7/CPU0:R1(config-bgp)#exit
RP/0/7/CPU0:R1(config)#exit

Now, time to see if we have a neighbor established:
RP/0/7/CPU0:R1#sh bgp nei 150.1.12.2
Thu Mar 29 22:48:13.338 UTC

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