H3C Technologies H3C Intelligent Management Center - Manual (Page 171)

RSVP maintains path and reservation state by periodically retransmitting two types of
messages: Path message and Reserve message. These periodically retransmitted Path and
Reserve messages are called refresh messages. They are sent along the path the last Path or
Reserve message travels to synchronize state between RSVP neighbors and recover lost RSVP
messages.
Where many RSVP sessions are present, periodically sent refresh messages become a
network burden. In addition, for some delay sensitive applications, the refreshing delay they
must wait for recovering lost RSVP messages may be unbearable. Therefore, you can set the
Path/Reserve message refresh interval(s) to address such problems.
The valid range of Path/Reserve message refresh interval is from 10 seconds to 65535
seconds, and the default value is 30 seconds.
• PSB and RSB Timeout Multiplier
To create an LSP tunnel, the sender sends a Path message with a LABEL_REQUEST object.
After receiving this Path message, the receiver assigns a label for the path and puts the label
binding in the LABEL object in the returned Resv message. The LABEL_REQUEST object is
stored in the path state block (PSB) on the upstream nodes, while the LABEL object is stored in
the reservation state block (RSB) on the downstream nodes. The state stored in the PSB or RSB
object times out and is removed after the number of consecutive non-refreshing times exceeds
the PSB or RSB timeout keep-multiplier. The valid range of PSB and RSB timeout multiplier is
from 3 to 255, and the default value is 3.
• Blockade Timeout Multiplier
You may sometimes want to store the resource reservation state for a reservation request that
does not pass the admission control on some node. This however should not prevent the
resources reserved for the request from being used by other requests. To handle this situation,
the node transits to the blockade state and a blockade state block (BSB) is created on each
downstream node. When the number of non-refreshing times exceeds the blockade multiplier,
the state in the BSB is removed. The default value is 4.
• Resource Reservation Confirmation
If you select Enabled from the Resource Reservation Confirmation list, you enable the RSVP
confirmation feature, which is used for improving the reliability of message transfer.
Configuring device RSVP HELLO extension information
The RSVP HELLO extension is configured to detect node failures. You can use this function to detect the
reachability of RSVP neighboring nodes.
To configure device RSVP HELLO extension information:
1. Click Service > MPLS TE Manager from the tabular navigation system on the top of the IMC main
page.
2. Click RSVP TE Advanced Features > Device Features in the left navigation tree.
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