R3303-HP HSR6800 Routers MPLS Configuration Guide

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• Change the next hop on an ASBR. With this method, MPLS LDP is not required between ASBRs.
The device supports only the second method. Therefore, MP-EBGP routes get their next hops changed by
default before being redistributed to MP-IBGP. However, normal EBGP routes to be advertised to IBGP do
not have their next hops changed by default. To change the next hop to a local address, use the peer
{ ip-address | group-name } next-hop-local command. For more information about the command, see
Layer 3—IP Routing Configuration Guide.
To configure inter-AS option B on ASBR PEs:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter interface view for the
interface connecting to the
remote ASBR-PE.
interface interface-type
interface-number
N/A
3. Configure the IP address of
the interface.
ip address ip-address { mask |
mask-length }
N/A
4. Return to system view.
quit N/A
5. Enter BGP view.
bgp as-number N/A
6. Enter BGP-VPNv4 subaddress
family view.
ipv4-family vpnv4 N/A
7. Disable route target based
filtering of VPNv4 routes.
undo policy vpn-target
By default, PE filters received
VPNv4 routes by route targets.
The routes surviving the filtering
are added to the routing table, and
the others are discarded.
In the inter-AS option B solution, the ASBR PEs must maintain all VPNv4 routing information and advertise
the information to peer ASBR PEs. In this case, the ASBR PEs must receive all VPNv4 routing information
without performing route target-based filtering.
In the inter-AS option B solution, for the same VPN, the route targets for the VPN instances on the PEs in
different ASs must match.
Configuring inter-AS option C
To configure inter-AS option C, perform proper configurations on PEs and ASBR PEs, and configure
routing policies on the ASBR PEs.
Configuring the PEs
You must establish an ordinary IBGP peer relationship between a PE and an ASBR PE in an AS and an
MP-EBGP peer relationship between PEs of different ASs.
The PEs and ASBR PEs in an AS must be able to exchange labeled IPv4 routes.
To configure a PE for inter-AS option C:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter BGP view.
bgp as-number N/A