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Knowledge Base

How to import default route when OSPF cross BGP MPLS domain

Publication Date:  2012-07-27  |   Views:  174  |   Downloads:  0  |   Author:  liuyufeng  |   Document ID:  EKB0000399141

Contents
Issue Description Alarm Information Handling Process Root Cause Suggestions

Issue Description

Topology:
Internet Firewall(E1000)----MCE1(S8500-1)---PE1(NE40E1)---P(NE80E)---PE2(NE40E2)--MCE2(S8500-2)--GGSN.
S8500-1 run OSPF with NE40E-1 in area 0, S8500-2 and GGSN run OSPF with NE40E-2 in area 0.
Need see the derault route in GGSN and mobile subscriber behind GGSN need visit internet.

Alarm Information

Null

Handling Process

Here is the key configuration.
In S8500-1
#
ospf 10 vpn-instance vpn_gi
 import-route bgp
 default-route-advertise always
#
In NE40E01
#
bgp 65535
 ipv4-family vpn-instance vpn_gi
 import-route ospf 10
 default-route imported
#
ospf 10 vpn-instance vpn_gi
 import-route bgp
#
In NE40E02
#
bgp 65535
 ipv4-family vpn-instance vpn_gi
 import-route ospf 10
#
ospf 10 vpn-instance vpn_gi
 default-route-advertise always
 import-route bgp
#
Then in S8500-2 and GGSN when display ip route we can see the default route in OSPF.Mobile subscrible can visit internet.

Root Cause

The default route can not imported between OSPF and BGP MPLS VPN.Need configure manually.

Suggestions

Null 
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