Procedure
Step 1 Configure IGP on the MPLS backbone networks of AS100 and AS200. In this manner, PEs
within each MPLS backbone network can be interconnected with ASBRs.
In this example, IGP adopts OSPF, and the specific configuration steps are not mentioned here.
NOTE
Advertise the 32-bit IP address of the loopback interface, that is, the LSR ID, by using OSPF.
After the configuration, the OSPF neighbor relationship can be established between the ASBR
and the PE in the same AS. Run the display ospf peercommand to find that the neighboring
state is Full.
Take PE1 as an example:
<PE1> display ospf peer
OSPF Process 1 with Router ID 1.1.1.9
Neighbors
Area 0.0.0.0 interface 172.1.1.2(GigabitEthernet1/0/0)'s neighbors
Router ID: 2.2.2.9 Address: 172.1.1.1
State: Full Mode:Nbr is Master Priority: 1
DR: None BDR: None MTU: 0
Dead timer due in 28 sec
Neighbor is up for 00:01:04
Authentication Sequence: [ 0 ]
The ASBR and PE in the same AS can learn the IP address of the loopback1 interface of each
other. They can also ping each other successfully.
Step 2 Establish the EBGP peer relationship between the ASBRs.
# Configure ASBR1.
[ASBR1] bgp 100
[ASBR1-bgp] peer 192.1.1.2 as-number 200
[ASBR1-bgp] quit
# Configure ASBR2.
[ASBR2] bgp 200
[ASBR2-bgp] peer 192.1.1.1 as-number 100
[ASBR2-bgp] quit
After the configuration, run the display bgp peer command on ASBRs to find the adjacency
status is Established.
Take ASBR1 as an example:
[ASBR1] display bgp peer
BGP local router ID : 2.2.2.9
Local AS number : 100
Total number of peers : 1 Peers in established state : 1
Peer V AS MsgRcvd MsgSent OutQ Up/Down State PrefRcv
192.1.1.2 4 200 129 134 0 01:39:21 Established 1
Step 3 Advertise the routes of a PE in an AS to the remote PE.
# On ASBR1, advertise the loopback address of PE1 to ASBR2.
[ASBR1] route-policy policy0 permit node 1
Huawei AR1200 Series Enterprise Routers
Configuration Guide - VPN 3 BGP MPLS IP VPN Configuration
Issue 01 (2012-04-20) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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