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

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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 new sequence number equals the last sequence number, RSVP regards the message a replay
message and discards the message.
• If the new sequence number is smaller than the last sequence number but greater than the last
sequence number minus the window size, and has never been received before, RSVP accepts the
message. If the new sequence number has been received before, RSVP regards the message a
replay message and discards the message.
• If the new sequence number is smaller than or equal to the last sequence number minus the window
size, RSVP regards the message invalid and discards the message.
By default, the authentication window size is 1. If the sequence number of a newly received RSVP
message is smaller than that of the last accepted message, the device discards the message. However,
if the sender sends multiple RSVP messages in a short time, these messages might arrive at the neighbor
out of sequence. If you use the default window size, the out-of-sequence messages will be discarded. To
solve this problem, you can use the authentication window-size command to configure a correct window
size.
A security association established by using the authentication key configured in a view uses the window
size configured in that view.
A modification to the window size affects only security associations established after the modification. To
apply the new setting to existing security associations, you must execute the reset rsvp authentication
command to delete and then reestablish the security associations.
Examples
# In RSVP view, set the maximum number of out-of-sequence authenticated RSVP messages that can be
received to 10.
<Sysname> system-view
[Sysname] rsvp
[Sysname-rsvp] authentication window-size 10
# In RSVP neighbor view, set the maximum number of out-of-sequence authenticated RSVP messages that
can be received from the RSVP neighbor 1.1.1.9 to 10.
<Sysname> system-view
[Sysname] rsvp
[Sysname-rsvp] peer 1.1.1.9
[Sysname-rsvp-peer-1.1.1.9] authentication window-size 10
Related commands
• authentication challenge
• authentication key
• authentication lifetime
• display rsvp authentication
• reset rsvp authentication
• rsvp authentication challenge
• rsvp authentication key
• rsvp authentication lifetime