
Configuring IP Services
6-12 114065 Rev. A
Enabling Multihop Connections
By default, BGP enforces the one-hop rule for BGP peers -- the remote peer must
be located on a directly attached network.
You can use Site Manager to override the restriction and allow multihop
connections.
Disabling Dynamic Policy Configuration
By default, BGP configures IP policies dynamically. This means that if you
modify a policy, BGP dynamically re-evaluates all affected routes in the light of
the modified policy. BGP then sends the appropriate withdraw or update to the
affected peers. BG P maintains records of which routes have been sent to which
peer. This allows for precise determination of which routes must be sent and
which must be withdrawn.
You can use Site Manager to disable and re-enable dynamic policy configuration.
If you modify an IP policy with this feature disabled, BGP restarts all BGP
connections. There is no advantage to disabling dynamic policy configuration.
Disabling this parameter will significantly impact BGP protocol operation
overhead and network stability.
Caution: Enabling multihop BGP connections is dangerous because it can
cause BGP speakers to establish a BGP connection that traverses a third-party
AS, which may violate policy considerations and may also introduce
forwarding loops.
Site Manager: Multi-hop EBGP Connection parameter: page A-4
Site Manager: Dynamic Policy Change parameter: page A-5
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