R0106-HP MSR Router Series MPLS Command Reference(V7)

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Related commands
• authentication challenge
• authentication key
• authentication lifetime
• authentication window-size
• display rsvp authentication
• reset rsvp authentication
• rsvp authentication challenge
• rsvp authentication key
• rsvp authentication window-size
rsvp authentication window-size
Use rsvp authentication window-size to configure the RSVP authentication window size, which is the
maximum number of authenticated RSVP messages that can be received out of sequence on an interface.
Use undo rsvp authentication window-size to restore the default.
Syntax
rsvp authentication window-size number
undo rsvp authentication window-size
Default
Only one authenticated RSVP message can be received out of sequence on an interface.
Views
Interface view
Predefined user roles
network-admin
Parameters
number: Specifies the maximum number of authenticated RSVP messages that can be received out of
sequence, in the range of 1 to 64.
Usage guidelines
To protect against replay attacks, the sender places a unique sequence number in each RSVP message
that contains authentication information. The sender increases the value of the sequence number by one
each time it sends an RSVP message. If the sequence number of a received message is in the specified
authentication window size, the receiver accepts the message. Otherwise, the receiver discards the
message.
When the receiver receives an RSVP message, it compares the sequence number of the last accepted
RSVP message with the sequence number of the newly received RSVP message.
• If the new sequence number is greater than the last sequence number, RSVP accepts the message
and updates the last sequence number with the new sequence number.
• If the received sequence number equals the last sequence number, RSVP regards the message a
replay message and discards the message.