How to import routes dynamically from global routing table to a VRF

[Djule2804]

Hi,

I've got a problem to import dynamically a route from a global routing table to a VRF.

So here is my configuration :

ip vrf TEST

rd 1:1

import ipv4 unicast map IMPORT

interface Vlan1

ip address 192.168.1.1 255.255.255.0

ip policy route-map IMPORT

router bgp 300

no synchronization

bgp log-neighbor-changes

network 5.5.5.0 mask 255.255.255.0

neighbor 100.2.1.2 remote-as 400

neighbor 100.2.1.2 ebgp-multihop 255

distribute-list prefix filter in

no auto-summary

ip prefix-list filter seq 5 permit 6.6.6.6/32

route-map IMPORT permit 10

match ip address prefix-list filter

This configuration is working fine but only once. When I am doing a clear ip bgp *, the new route "6.6.6.6" doesn't appear again in my VRF table.

WHen I check the global routing table the route reappear after few secondes (BGP update).

So I have to enter the command "no import ipv4 unicast map IMPORT" then "import ipv4 unicast map IMPORT" to get back the route 6.6.6.6 into the VRF.

Is there a solution to do this automatically without entering these two commands?

Best Regards

Julien

[Edison Ortiz · Accepted solution]

Julien,

It works for me, there is a delay of about 1 or 2 minutes but it works.

R2#clear ip bgp *

R2#

00:17:41: %BGP-5-ADJCHANGE: neighbor 192.168.12.1 Down User reset

Then I check CEF

The route appears in the global table

R2#sh ip cef

Prefix Next Hop Interface

0.0.0.0/32 receive

1.1.1.1/32 192.168.12.1

But it's not in the VRF

R2#sh ip cef vrf NETPRO

Prefix Next Hop Interface

0.0.0.0/32 receive

21.1.1.0/24 attached Loopback1

21.1.1.0/32 receive

Waited about 2 minutes then it showed:

R2#sh ip cef vrf NETPRO

Prefix Next Hop Interface

0.0.0.0/32 receive

1.1.1.1/32 192.168.12.1

R2#sh ip bgp vpn all

BGP table version is 2, local router ID is 23.3.3.3

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,

r RIB-failure, S Stale

Origin codes: i - IGP, e - EGP, ? - incomplete

Network Next Hop Metric LocPrf Weight Path

Route Distinguisher: 1:1 (default for vrf NETPRO)

Import Map: NETPRO, Address-Family: IPv4 Unicast, Pfx Count/Limit: 1/1000

*>i1.1.1.1/32 192.168.12.1 0 100 0 i

My config portion:

ip vrf NETPRO

rd 1:1

import ipv4 unicast map NETPRO

ip prefix-list NETPRO seq 5 permit 1.1.1.1/32

!

!

router bgp 65001

no synchronization

bgp log-neighbor-changes

neighbor 192.168.12.1 remote-as 65001

no auto-summary

!

address-family ipv4 vrf NETPRO

no auto-summary

no synchronization

exit-address-family

route-map NETPRO permit 10

match ip address prefix-list NETPRO

!

route-map NETPRO permit 20

!

R2#sh ver | i IOS

Cisco IOS Software, 7200 Software (C7200-K91P-M), Version 12.2(25)S15, RELEASE SOFTWARE (fc1)

I noticed you can accelerate this process by clearing the route table then CEF gets refreshed.

HTH,

__

Edison.

[Djule2804]

Hi Edison

Thanks a lot for answering to my post.

It was very helpfull and now my problem is resolved.

Regards,

Julien

[Laurent Aubert]

Hi,

The trigger for evaluation of this import feature is when an update/withdrawn is received or during the BGP scanner which occurs every 60s.

HTH

Laurent.