Re: L3VPN MPLS - Internal BGP between CE - PE

[Javor Kliachev <jkliachev () neterra net>]

Dear Keegan,

Thank you for your advice!

Here is the output of my configuration and applied debug commands:

# PE router config:

The session bellow is between PE and CE:

router bgp 34224
!
address-family ipv4 vrf DEF
  redistribute connected
  redistribute static
  neighbor 10.18.7.1 remote-as 34224
  neighbor 10.18.7.1 description to_echo-sdc_CE
  neighbor 10.18.7.1 activate
  neighbor 10.18.7.1 send-community both
  neighbor 10.18.7.1 prefix-list Permit_Default in
  neighbor 10.18.7.1 route-map NEXT-HOP-SELF in
  neighbor 10.18.7.1 route-map NEXT-HOP-SELF out
  no synchronization
 exit-address-family
end

Hotel-st_PE#show route-map NEXT-HOP-SELF
route-map NEXT-HOP-SELF, permit, sequence 10
  Match clauses:
  Set clauses:
    ip next-hop peer-address
  Policy routing matches: 0 packets, 0 bytes


Hotel-st_PE#show ip bgp vpnv4 vrf DEF summary
Neighbor        V    AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  
State/PfxRcd
10.18.7.1       4 34224      85      38   894079    0    0 00:00:02        1

Hotel-st_PE#show ip bgp vpnv4 vrf DEF neighbors 10.18.7.1 routes

   Network          Next Hop            Metric LocPrf Weight Path
Route Distinguisher: 34224:151 (default for vrf DEF)
*>i0.0.0.0          10.18.7.1                0    120      0 i


Hotel-st_PE#show ip route vrf DEF

     23.0.0.0/32 is subnetted, 1 subnets
S       23.23.23.23 [1/0] via 10.18.7.1
     24.0.0.0/32 is subnetted, 1 subnets
C       24.24.24.24 is directly connected, Loopback30
     10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
B       10.100.187.1/32 [200/0] via 10.1.7.253, 00:16:16
C       10.18.7.0/29 is directly connected, Vlan187
B*   0.0.0.0/0 [200/0] via 10.18.7.1, 00:08:40


#### Bravo-plv is other test PE router which should receive and use 
"default route"

bravo-plv_PE#show ip route vrf DEF

     23.0.0.0/32 is subnetted, 1 subnets
B       23.23.23.23 [200/0] via 10.1.1.253, 1w5d
     24.0.0.0/32 is subnetted, 1 subnets
B       24.24.24.24 [200/0] via 10.1.1.253, 2w0d
     10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C       10.100.187.1/32 is directly connected, Loopback100
B       10.18.7.0/29 [200/0] via 10.1.1.253, 1w6d
B*   0.0.0.0/0 [200/0] via 10.18.7.1, 00:02:37

### this ping is OK because 10.18.7.0/29 is connected on the PE router.

bravo-plv_PE#ping vrf DEF 10.18.7.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.18.7.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/4 ms

### 212.73.140.140.190 isn't in routing table. It is direct connected 
network on
interface on CE and passing via "default route"

bravo-plv_PE#ping vrf DEF 212.73.140.190

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 212.73.140.190, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)

This is very strange:
-------------------------------------------------------------------------------------------------
## this output showing that the router not set MPLS label for 0.0.0.0/0

Only for static and the connected networks.

bravo-plv_PE#show ip cef vrf DEF 10.18.7.0/29
10.18.7.0/29
  nexthop 10.1.7.1 Vlan15 label 76 43

bravo-plv_PE#show ip cef vrf DEF 0.0.0.0/0
0.0.0.0/0
  recursive via 87.121.83.25 unusable: no label
-------------------------------------------------------------------------------------------------

Best~

--
---
*Javor Kliachev*
IP engineer

Neterra Ltd.
Telephone: +359 2 975 16 16
Fax: +359 2 975 34 36
Mobile: +359 885 988 495
www.neterra.net <http://www.neterra.net>