MPLS VPN route import

[Ratheesh mv]

PE-1 is advertising routes to PE-5 via MP-BGP. Route-target import has not been configured on PE-5 for VRF TEST although routes are being received and installed in "show ip bgp vpnv4 all" but not not being installed in show ip bgp vpnv4 vrf TEST.

Why is PE-5 accepting routes and installed in "show ip bgp vpnv4 all" even though route-target export has not been configured? Is it default behavior , kind of bug or configuration mistake ?

PE-5#sh running-config | section vrf ->VRF configuration
ip vrf TEST
rd 5:5
route-target export 100:100
ip vrf forwarding TEST

[balaji.bandi · Accepted solution]

we may be receiving  GRT, is there any announcement in GRT  From P ? 

post the config of the device all.

show us an example output of the route you receiving in PE 5

[Ratheesh mv]

Hi balaji.bandi

It was configuration mistake . I configured route-reflector client command on PE-5 that is what it was receiving all routes without matching import command .Thanks for response.

I would like to clear one more doubt. As per my understanding if PE-5 receive subnet "x" from different PE routers, PE-5 installs all information in  "show ip bgp vpnv4 all" and import only best path to "show ip bgp vpnv4 vrf TEST". I hope I am correct. If it is wrong please correct it 

[balaji.bandi · Accepted solution]

when you export and import used, all will be exported and imported.

you can view best as per below :

show ip bgp vpnv4 vrf XXX

Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
              r RIB-failure, S Stale, m multipath, b backup-path, x best-external

[Ratheesh mv]

May I know why I am getting different output in each VRF table.? 

As per my understanding import only best path to VRF table. show ip bgp vpnv4 vrf xxx .

>When PE-5 importing 10.89.16.0/24, it is being shown only best path in VRF TEST table but same time there are all paths in VRF NEW.

>VRF NEW is having same RD value on PE-5 (Import PE for 10.89.16.0/24) and on PE-1 and PE-2 (Export PE for 10.89.16.0/24)(RD=1:1)

>VRF TEST is having rd 5:5 on PE-5 (Import PE for 10.89.16.0/24) and on PE-1 and PE-2 are having rd 1:1 (Export PE for 10.89.16.0/24)

PE-5#sh ip bgp vpnv4 all
BGP table version is 101, local router ID is 5.5.5.5
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

Network Next Hop Metric LocPrf Weight Path
Route Distinguisher: 1:1 (default for vrf NEW)
*>i 10.89.16.0/24 2.2.2.2 0 100 0 65000 ?
* i                         2.2.2.2 0 100 0 65000 ?
Route Distinguisher: 5:5 (default for vrf TEST)
*>i 10.89.16.0/24 2.2.2.2 0 100 0 65000 ?
PE-5#

PE-5#sh ip bgp vpnv4 vrf TEST
BGP table version is 101, local router ID is 5.5.5.5
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

Network Next Hop Metric LocPrf Weight Path
Route Distinguisher: 5:5 (default for vrf TEST)
*>i 10.89.16.0/24 2.2.2.2 0 100 0 65000 ? ---->Showing only best path 
PE-5#

PE-5#sh ip bgp vpnv4 vrf NEW
BGP table version is 101, local router ID is 5.5.5.5
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, f RT-Filter,
x best-external, a additional-path, c RIB-compressed,
Origin codes: i - IGP, e - EGP, ? - incomplete
RPKI validation codes: V valid, I invalid, N Not found

Network Next Hop Metric LocPrf Weight Path
Route Distinguisher: 1:1 (default for vrf NEW)
*>i 10.89.16.0/24 2.2.2.2 0 100 0 65000 ?
* i                      2.2.2.2 0 100 0 65000 ?---->Showing all imported paths 
PE-5#

VRF configuration of PE routers

=========================

PE-1 - VRF
==========
ip vrf TEST
rd 1:1
route-target export 200:200

PE-2 - VRF
==========
ip vrf TEST
rd 1:1
route-target export 200:200

PE-5 - VRF
==========
ip vrf NEW
rd 1:1
route-target import 200:200

ip vrf TEST
rd 5:5
route-target import 200:200

[Harold Ritter]

Hi @Ratheesh mv ,

This is not default behavior. Do you have "no bgp default route-target filter" configured on PE-5 by any chance?

Regards,

[Ratheesh mv · Accepted solution]

Hi Harold Ritter

It was configuration mistake . I configured route-reflector client command on PE-5 that is what it was receiving all routes without matching import command .Thanks for response.