Rt updating bgp 0 0 0 0 0

This method will route traffic out the source VRF to the global table and back in the destination VRF.

rt updating bgp 0 0 0 0 0-4rt updating bgp 0 0 0 0 0-30

ip extcommunity-list standard V5 permit rt 1:5 ip extcommunity-list standard V7 permit rt 1:7 !

ip prefix-list IMPORT-5 seq 5 permit 17.1.1.0/24 ip prefix-list IMPORT-5 seq 15 permit 1.0/24 ip prefix-list IMPORT-7 seq 5 permit 55.5.1.0/24 ip prefix-list IMPORT-7 seq 15 permit 1.0/24 !

A RT or route-target on the other hand is a BGP extended community which gets attached when a prefix is exported from the VRF RIB table into the VRF-aware BGP table to identify VPN membership.

The confusing part is that the RT import/export function in Cisco IOS is defined under the VRF configuration section and not under the BGP section. This means without BGP enabled on Router1, the RT import/export would yield no result.

For this two routes are needed in the global RIB for the next-hop IPs of VPN5 and VPN7: interface Fast Ethernet0/0 ip vrf forwarding VPN5 ip address 1.1 255.255.255.0 !

interface Fast Ethernet0/1 ip vrf forwarding VPN7 ip address 1.1 255.255.255.0 !

So to test 17.1.1.0/24 should be allowed to ping 55.5.1.0/24 but no other 55.5 range.

This is done by using the command “ip route vrf NAME x.x.x.x s.s.s.s global”.

Here is the config to complete the first option: ip vrf VPN5 rd 100:5 import map V5-MAP route-target export 1:5 route-target import 1:5 route-target import 1:7 !

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