From: Huan Pham (Huan.Pham@peopletelecom.com.au)
Date: Tue Aug 05 2008 - 01:55:41 ART
Hi,
You'd better post full config, or additional show output, e.g.
Show ip bgp summ,
Show ip bgp
show ip bgp nei x.x.x.x receive-route
Assumming that BGP between CE-PE are OK, and CE1 got routes advertized
from PE1, but cannot install them in the routing table, then most likely
it's because CE do not have routes to the next hop (PE2 IP).
Try the following, and see how you go from there:
PE1#
router bgp 64512
address-family ipv4 vrf one
neighbor 172.16.1.2 remote-as 64513
! You need this
neighbor 172.16.1.2 next-hop-self
! And maybe add the following on both PE1, PE2, if you use same AS 64513
on CE2
neighbor 172.16.1.2 as-override
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
CCIE GURU
Sent: Tuesday, 5 August 2008 2:14 PM
To: Cisco certification
Subject: BGP routes can't learn from PE to CE
Hello all gentelman!
Here is my topology.And I am trying to build MPLS VPN. I want to
advertise routes from both CEs to each other across MPLS backbone.
CE1------PE1-----Core1------Core2------PE2------CE2
PE & CE are eBGP neighbor.
Route from CE2 advertise to until PE1. But PE1 seems don't re-advertise
route from CE2 to CE1.
PE1#sh ip bgp vpnv4 all neighbors 172.16.1.2 advertised-routes BGP table
version is 10, local router ID is 1.1.1.3 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: 64512:1 (default for vrf one)
*>i1.1.1.6/32 1.1.1.4 0 100 0 64513 ?
*>i172.16.2.0/30 1.1.1.4 0 100 0 64513 ?
Total number of prefixes 2
*Sh ip route on PE1*
PE1#sh ip route vrf one
Routing Table: one
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS
level-2
ia - IS-IS inter area, * - candidate default, U - per-user static
route
o - ODR, P - periodic downloaded static route Gateway of last
resort is not set
1.0.0.0/32 is subnetted, 2 subnets
B 1.1.1.5 [20/0] via 172.16.1.2, 00:22:14
B 1.1.1.6 [200/0] via 1.1.1.4, 00:22:14
172.16.0.0/30 is subnetted, 2 subnets
C 172.16.1.0 is directly connected, FastEthernet1/0
B 172.16.2.0 [200/0] via 1.1.1.4, 00:22:14
PE1#
*Here is PE1 config*
PE1#sh run | b router bgp
router bgp 64512
no bgp default ipv4-unicast
bgp log-neighbor-changes
neighbor 1.1.1.4 remote-as 64512
neighbor 1.1.1.4 update-source Loopback0 !
address-family ipv4
neighbor 1.1.1.4 activate
no auto-summary
no synchronization
exit-address-family
!
address-family vpnv4
neighbor 1.1.1.4 activate
neighbor 1.1.1.4 send-community extended exit-address-family !
address-family ipv4 vrf one
neighbor 172.16.1.2 remote-as 64513
neighbor 172.16.1.2 activate
no auto-summary
no synchronization
exit-address-family
*CE verify*
**
CE1#sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS
level-2
ia - IS-IS inter area, * - candidate default, U - per-user static
route
o - ODR, P - periodic downloaded static route Gateway of last
resort is not set
1.0.0.0/32 is subnetted, 1 subnets
C 1.1.1.5 is directly connected, Loopback0
172.16.0.0/30 is subnetted, 1 subnets
C 172.16.1.0 is directly connected, FastEthernet0/0
Please adivce.
Regards
Blogs and organic groups at http://www.ccie.net
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