IP Router Configuration
Router Configuration Guide 53
BFD for RSVP-TE
BFD will notify RSVP-TE if the BFD session goes down, in addition to notifying other
configured BFD enabled protocols (for example, OSPF, IS-IS and PIM). This notification
will then be used by RSVP-TE to begin the reconvergence process. This greatly accelerates
the overall RSVP-TE response to network failures.
All encapsulation types supporting IPv4 and IPv6 is supported as all BFD packets are carried
in IPv4 and IPv6 packets; this includes Frame Relay and ATM.
BFD is supported on the following interfaces:
• Ethernet (Null, Dot1Q & QinQ)
• Spoke SDPs
• LAG interfaces
The following interfaces are supported only on the 7750 SR and 7450 ESS:
• VSM interfaces
• POS interfaces (including APS)
• Channelized interfaces (PPP, HDLC, FR and ATM) on ASAP (priority 1) and
channelized MDAs (Priority 2) including link bundles and IMA
Echo Support
Echo support for BFD calls for the support of the echo function within BFD. By supporting
BFD echo, the router loops back received BFD echo messages to the original sender based
on the destination IP address in the packet.
The echo function is useful when the local router does not have sufficient CPU power to
handle a periodic polling rate at a high frequency. As a result, it relies on the echo sender to
send a high rate of BFD echo messages through the receiver node, which is only processed
by the receiver’s forwarding path. This allows the echo sender to send BFD echo packets at
any rate.
The SR OS router does not support the sending of echo requests, only the response to echo
requests.
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