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Configuring Trunks
About LTP
ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000 1/19/057-3
About LTP
Using Link Trunk Protocol (LTP), switches communicate by exchanging KA control
frames. Switches send KA requests at regular time intervals (one per second). After a
switch receives a KA request, it returns a KA reply, which results in a completed
transaction. The request and reply frame formats are identical.
Trunk Delay
Figure 7-1 illustrates the process of KA frames used to measure trunk delay. When
Switch A sends a KA request to Switch B, a time stamp is put into the KA request
frame. When Switch B receives the KA request, it sends a KA reply to Switch A.
Switch A receives the KA reply and calculates the round-trip delay from Switch A to
Switch B.
Figure 7-1. Trunk Delay - OSPF Metric and KA Messaging
KA Threshold
The KA Threshold field in the Add Trunk dialog box represents the number of retries
that the trunk protocol attempts before bringing the trunk down. The retry interval is
represented in seconds. You can set the KA threshold value between 3 and 255
seconds. The default is 5 seconds.
Direct or OPTimum Trunk
KA Request
KA Reply
KA Request
KA Reply
Switch B
Switch A
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