Configuring Bgp As Number Substitution And Soo - HP 10500 SERIES Configuration Manual

Step
5. Configure a sham link.
If you start OSPF but do not configure the router ID, the system automatically elects one. However, the
same election rules produce the same router ID. Therefore, HP recommends that you configure the router
ID when starting an OSPF process. For the election rules, see Layer 3—IP Routing Configuration Guide.
If you configure multiple OSPF VPN instances but do not configure the route tag, the system automatically
creates one based on the AS number configured. If you do not configure BGP, the tag is 0. However, the
same calculation rule produces the same tag, and hence the same tag is created for multiple OSPF VPN
instances on the same PE or PEs with the same AS number. Therefore, HP recommends configuring
different tags for different OSPF VPN instances.

Configuring BGP AS number substitution and SoO

When CEs at different sites have the same AS number, configure the BGP AS number substitution function
to avoid route loss.
With the BGP AS number substitution function, when a PE advertises a route to the specified CE, if an AS
number identical to that of the CE exists in the AS_PATH of the route, it is replaced with that of the PE
before the route is advertised.
If the PE connects to multiple CEs in the same site, use a routing policy to add the SoO attribute to the
routes received from the CEs.
Before you configure BGP AS number substitution and SoO, complete the following tasks:
Configure basic MPLS L3VPN.
•
Make sure CEs at different sites have the same AS number.
•
To configure BGP AS number substitution and SoO:
Step
1. Enter system view.
2. Create a routing policy and
enter routing policy view.
3. Specify an SoO attribute
value.
4. Return to system view.
5. Enter BGP view.
6. Enter BGP VPN instance view.
Command
sham-link source-ip-address
destination-ip-address [ cost cost |
dead dead-interval | hello
hello-interval | retransmit
retrans-interval | trans-delay delay
| simple [ cipher | plain ]
password | { md5 | hmac-md5 }
key-id [ cipher | plain ]
password ]*
Command
system-view
route-policy route-policy-name
permit node node-number
apply extcommunity soo
site-of-origin additive
quit
bgp as-number
ipv4-family vpn-instance
vpn-instance-name
269
Remarks
By default, no sham link is
configured.
Remarks
N/A
Optional.
No routing policy is created by
default.
Optional.
Not specified by default.
N/A
N/A
N/A