Brocade Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide (Supporting R05.6.00) - Manual (Page 61)

Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide 37
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Auto-bandwidth for RSVP LSPs
1
Syslog messages
The following notification Syslog messages are logged under the conditions indicated. No
additional traps are generated.
1. When first path error requesting soft preemption is received for an LSP, following message is
printed to Syslog.
Dec 9 23:58:49 Brocade MPLS: LSP test soft preemption triggered. Preemption
point 10.1.1.20
2. When MBB is successful for make before break setup of soft preemption requested LSP,
following message is printed to Syslog.
Dec 9 23:58:49 Brocade MPLS: LSP test using path NULL soft preempted with make
before break
Auto-bandwidth for RSVP LSPs
Automatic bandwidth allocation allows an MPLS tunnel to automatically adjust its bandwidth
allocation based on the volume of traffic flowing through the tunnel. The new bandwidth is
determined by inspecting the traffic flowing through the LSP.
The user can configure an LSP with minimal bandwidth. And with this feature, the user can
dynamically adjust the LSPs bandwidth allocation based on current traffic patterns. The bandwidth
adjustments do not interrupt traffic flow through the tunnel.
At the end of the automatic bandwidth adjustment time interval, the current maximum average
bandwidth usage is compared with the allocated bandwidth for the LSP. When the LSP needs more
bandwidth, an attempt is made to set up a new path where bandwidth is equal to the current
maximum average usage. When the attempt is successful, the LSPs traffic is routed through the
new path and the old path is removed. When the attempt fails, the LSP continues to use its current
path.