Alcatel-Lucent 7450 Configuration Manual page 70

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Bi-directional Forwarding Detection

Handling of Control Packets

All control plane packets will not see the LDP shortcut route entry in RTM with the exception of

the following control packets which will be forwarded over an LDP shortcut when enabled:

All other control plane packets that require an RTM lookup and knowledge of which destination is

reachable over the LDP shortcut will continue to be forwarded over the IP next-hop route in RTM.

Handling of Multicast Packets

Multicast packets cannot be forwarded or received from an LDP LSP. This is because there is no

support for the configuration of such an LSP as a tunnel interfaces in PIM. Only an RSVP P2MP

LSP is currently allowed.

If a multicast packet is received over the physical interface, the RPF check will not resolve to the

LDP shortcut as the LDP shortcut route in RTM is not made available to multicast application.

Interaction with BGP Route Resolution to an LDP FEC

There is no interaction between an LDP shortcut for BGP next-hop resolution and the LDP

shortcut for IGP route resolution. BGP will continue to resolve a BGP next-hop to an LDP shortcut

if the user enabled the following option in BGP:

config>router>bgp>next-hop-resolution>shortcut-tunnel

A locally generated or in transit ICMP Ping and trace route of an IGP route. The transit

message appears as a user packet to the ingress LER node.

A locally generated response to a received ICMP ping or trace route message.

resolution-filter ldp

7450 ESS Router Configuration Guide