Specifications

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Cisco MGX 8800/8900 Series Software Configuration Guide
Release 5.1, Part Number OL-6482-01, Rev. A0, January 25, 2005
Chapter 8 Managing PNNI Nodes and PNNI Routing
Managing Priority Bumping
0 0 0 1
P2MP Details:
Type <CR> to continue, Q<CR> to stop:
DSPPNPORT (P=Persistent, NP=Non-Persistent, Pa = Party, Act=Active)
Type #Root: #Leaf: #Party:
svcc: 0 0 0
svpc: 0 0 0
#Spvc-P: #Spvc-NP: #SpvcAct: #Spvp-P: #Spvp-NP: #SpvpAct:
0 0 0 0 0 0
#SpvcPa-P:#SpvcPaAct:#SpvpPa-P: #SpvpPaAct:
0 0 0 0
Managing Priority Bumping
Release 5.0 introduces a new feature called priority bumping. This feature, which is designed for
enterprise networks, can automatically release lower priority connections to make resources available
for routing a higher priority connection. Priority bumping occurs only when all of the following are true:
• The AvCR or available LCN count on an ingress or egress interface is too low to support a priority
connection.
• The connection that needs routing has a higher priority than existing connections, and releasing the
preconfigured number of lower priority connections will produce the needed resources.
The priority bumping feature uses the same priority values used for priority routing. The priority range
is 0 to 15. Priority 0 is the highest priority, and priority 15 is the lowest. Priority 0 is used for routing
control channels (RCCs) and cannot be assigned to other connection types. The valid range for priority
configuration is 1 to 15. Routing priority is assigned to connections in either of the following ways:
• The routing priority is assigned to an SPVC or SPVP using the addcon or cnfcon commands.
• The routing priority is assigned to an interface using the cnfpnportsig command. When the routing
priority is assigned to an interface, the configured priority applies to all SVCs that use the interface
and any SPVCs or SPVPs for which the routing priority has been deleted. (This happens when the
priority services information element (IE) is deleted or not supported on another node.)
The following sections describe the tasks for managing the priority bumping feature:
• Enabling, Configuring, and Disabling Priority Bumping
• Displaying the Priority Bumping Configuration
• Displaying Priority Bumping Statistics
• Resetting the Priority Bumping Statistics
• Displaying Priority Bumping Resource Usage
Enabling, Configuring, and Disabling Priority Bumping
When you enable priority bumping, you should enable it on all nodes in the network. If some nodes are
running software released prior to Release 5, those nodes will respond as if priority bumping is disabled.
When priority bumping is disabled on some nodes and not others, the enabled nodes will bump
connections for higher priority connections, and those higher priority connections might be rejected at
overloaded nodes that do not support priority bumping. This results in needless connection bumping for
the lower priority connections.