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MPLS and RSVP-TE
The above capabilities are referred to collectively as "refresh overhead reduction extensions".
When the refresh-reduction is enabled on a 7705 SAR RSVP-TE interface, the node
indicates this to its peer by setting a "refresh-reduction-capable" bit in the flags field of the
common RSVP-TE header. If both peers of an RSVP-TE interface set this bit, all the above
three capabilities can be used. Furthermore, the node monitors the settings of this bit in
received RSVP-TE messages from the peer on the interface. As soon as this bit is cleared,
the 7705 SAR stops sending summary refresh messages. If a peer did not set the "refresh-
reduction-capable" bit, a node does not attempt to send summary refresh messages.
However, if the peer did not set the "refresh-reduction-capable" bit, then a node with refresh
reduction enabled and reliable message delivery enabled will still attempt to perform reliable
message delivery with this peer. If the peer does not support the message_id object, it returns
the error message "unknown object class". In this case, the 7705 SAR node retransmits the
RSVP-TE message without the message_id object and reverts to using this method for future
messages destined for this peer.
The no form of the command reverts to the default value.
Default
no refresh-reduction
reliable-delivery
Syntax
[no] reliable-delivery
Context
config>router>rsvp>if>refresh-reduction
Description
This command enables reliable delivery of RSVP-TE messages over the RSVP-TE interface.
When refresh-reduction is enabled on an interface and reliable-delivery is disabled, then
the 7705 SAR will send a message_id and not set ACK desired in the RSVP-TE messages
over the interface.
The 7705 SAR does not expect an ACK but will accept it if received. The node will also accept
message ID and reply with an ACK when requested. In this case, if the neighbor set the
"refresh-reduction-capable" bit in the flags field of the common RSVP-TE header, the node
will enter summary refresh for a specific message_id it sent regardless of whether it received
an ACK or not to this message from the neighbor.
When the reliable-delivery option is enabled on any interface, RSVP-TE message pacing is
disabled on all RSVP-TE interfaces of the system; for example, the user cannot enable the
msg-pacing option in the config>router>rsvp context, and an error message is returned in
CLI. When the msg-pacing option is enabled, the user cannot enable the reliable-delivery
option on any interface on this system. An error message will also be generated in CLI after
such an attempt.
The no form of the command reverts to the default value.
Default
no reliable-delivery
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Use subject to Terms available at: www.nokia.com
MPLS Guide
3HE 18686 AAAB TQZZA
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