Table Policy - Cisco NCS 6000 Series Configuration Manual

Implementing BGP
BGP is operating in STANDALONE mode.
Process
Speaker
Neighbor
10.0.101.1
10.0.101.2

Table Policy

The table policy feature in BGP allows you to configure traffic index values on routes as they are installed in
the global routing table. This feature is enabled using the table-policy command and supports the BGP policy
accounting feature.
BGP policy accounting uses traffic indices that are set on BGP routes to track various counters. See the
Implementing Routing Policy on Cisco IOS XR Software module in the Routing Configuration Guide for
Cisco NCS 6000 Series Routers for details on table policy use. See the Cisco Express Forwarding Commands
on Cisco IOS XR Software module in the IP Addresses and Services Command Reference for Cisco NCS
6000 Series Routers for details on BGP policy accounting.
Table policy also provides the ability to drop routes from the RIB based on match criteria. This feature can
be useful in certain applications and should be used with caution as it can easily create a routing 'black hole'
where BGP advertises routes to neighbors that BGP does not install in its global routing table and forwarding
table.
Update Groups
The BGP Update Groups feature contains an algorithm that dynamically calculates and optimizes update
groups of neighbors that share outbound policies and can share the update messages. The BGP Update Groups
feature separates update group replication from peer group configuration, improving convergence time and
flexibility of neighbor configuration.
To use this feature, you must understand the following concepts:
Related Topics
BGP Update Generation and Update Groups
The BGP Update Groups feature separates BGP update generation from neighbor configuration. The BGP
Update Groups feature introduces an algorithm that dynamically calculates BGP update group membership
based on outbound routing policies. This feature does not require any configuration by the network operator.
Update group-based message generation occurs automatically and independently.
BGP Update Group
When a change to the configuration occurs, the router automatically recalculates update group memberships
and applies the changes.
RecvTblVer
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Spk AS MsgRcvd MsgSent
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BGP Update Generation and Update Groups
BGP Update Group , on page 21
Routing Configuration Guide for Cisco NCS 6000 Series Routers, IOS XR Release 6.4.x
bRIB/RIB SendTblVer
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TblVer InQ OutQ Up/Down
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Table Policy
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