Hybrid Networks With Pxm45/C And Pxm45/A; Managing Priority Routing - Cisco MGX 8850 (PXM1E/PXM45) Configuration Manual

Chapter 8 Managing PNNI Nodes and PNNI Routing
Pure PXM45/B Networks Running Version 3.0.10 or Later
To improve rerouting performance in a pure PXM45/B based network (Version 3.0.10 or later), Cisco
recommends entering the following commands on the active PXM45/B in each switch:
For better call performance on PXM45/B cards, the following commands need to be issued after the
upgrading to Release 3.0.10:
•
•
To improve rerouting over specific NNI links, enter the following PXM45 commands at both ends of
each link:
•
•
These parameters are recommended only for the PXM45/B cards and not for the PXM45, PXM45/C, or
Note
PXM1E cards.

Hybrid Networks with PXM45/C and PXM45/A

If the recommended settings for a pure PXM45/C network are used in a network that contains PXM45/A
cards, the PXM45/A nodes can experience CLI lockout as a result of the volume of connections set up
by the PXM45/C cards. CLI lockout is a condition where switch response to CLI commands is very slow
because the switch is overloaded with other tasks. A normal deroute followed by a reroute will result in
a CLI lockout on the PXM45A node.
The CLI lockout is extensive when a PXM45/A node is a via node between PXM45C based end nodes
and there are permanently failed connections originating on the PXM45C end nodes. To prevent an
extensive lockout, configure the PXM45C nodes that are adjacent to the PXM45A node using the
following PXM command:
cnfnodalcongth -connpendhi 950 -connpendlo 750
Note This is same as the recommended threshold for PXM45/B nodes. This will configure the PXM45/C
nodes to limit the number of connection setups forwarded to the PXM45A node.

Managing Priority Routing

When an SPVC is created, it can be prioritized so that the user has more control over the sequence in
which connections are routed, rerouted, and derouted in the network. Should a trunk fail, the configured
priorities also apply to the rerouting of connections on the failed trunk.
Routing priorities are set in a range from 0 through 15, with 0 being the highest priority and 15 being
the lowest priority. 0 priority is reserved for networking control connections, while priorities 1 through
15 can be assigned to user connections.
Release 5.0.10, OL-3845-01 Rev. B0, August 16, 2004
cnfnodalcongth -connpendlo 750 -connpendhi 1000
cnfnodalcongth -setuphi 1000
cnfintfcongth <physical port> -setuphi 500
cnfpnctlvc <physical port> sscop -scr 3000
Cisco MGX 8850 (PXM1E/PXM45), Cisco MGX 8950, Cisco MGX 8830, and Cisco MGX 8880 Configuration Guide
Managing Priority Routing
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