Cisco Cisco IOS Software Release 12.2(33)SRE
Multi-Topology Routing
How to Configure Multi-Topology Routing
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Cisco IOS Release 12.2(33)SRB
Examples
The following example shows summary output for the show ip bgp topology command and the VIDEO
topology:
topology:
Router# show ip bgp topology VIDEO summary
BGP router identifier 192.168.3.1, local AS number 45000
BGP table version is 1, main routing table version 1
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
172.16.1.2 4 45000 289 289 1 0 0 04:48:44 0
192.168.3.2 4 50000 3 3 1 0 0 00:00:27 0
What to Do Next
Repeat this task for every topology that you want to enable, and repeat this configuration on all neighbor
routers that are to use the topologies. If you want to import routes from one MTR topology to another
on the same router, proceed to the next task.
routers that are to use the topologies. If you want to import routes from one MTR topology to another
on the same router, proceed to the next task.
Importing Routes from an MTR Topology Using BGP
Perform this task to import routes from one MTR topology to another on the same router, when multiple
topologies are configured on the same router. In this task, a prefix list is defined to permit prefixes from
the 10.2.2.0 network, and this prefix list is used with a route map to filter routes moved from the imported
topology. A global scope is configured, address family IPv4 is entered, the VIDEO topology is specified,
the VOICE topology is imported, and the routes are filtered using the route map named 10NET.
topologies are configured on the same router. In this task, a prefix list is defined to permit prefixes from
the 10.2.2.0 network, and this prefix list is used with a route map to filter routes moved from the imported
topology. A global scope is configured, address family IPv4 is entered, the VIDEO topology is specified,
the VOICE topology is imported, and the routes are filtered using the route map named 10NET.
Prerequisites
•
A global topology configuration has been configured and activated.
•
IP routing and CEF are enabled.
Step 13
clear ip bgp topology
{* | topology-name}
{as-number | dampening [network-address [net-
work-mask]] | flap-statistics [network-address
[network-mask]] | peer-group peer-group-name |
table-map
| update-group [number | ip-ad-
dress]} [in [prefix-filter] | out | soft [in
[prefix-filter] | out]]
Example:
Router# clear ip bgp topology VIDEO 45000
Resets BGP neighbor sessions under a specified topology or
all topologies.
all topologies.
Step 14
show ip bgp topology
{* | topology} summary
Example:
Router# show ip bgp topology VIDEO summary
(Optional) Displays BGP information about a topology.
•
Most standard BGP keywords and arguments can be
entered following the topology keyword.
entered following the topology keyword.
Note
Only the syntax required for this task is shown. For
more details, see the
more details, see the
Command or Action
Purpose