Configuring Vc Merge; Displaying The Vp Tunnel Configuration; Displaying The Vc Merge Configuration - Cisco Catalyst 8540 MSR Configuration Manual

Atm switch router software configuration guide

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Table of Contents

Configuring Tag Switching

The following example shows PVP 51 on ATM interface 0/1/1 connected to PVP 101 on ATM

interface 0/1/3:

Switch# show atm vp

Configuring VC Merge

VC merge allows the switch to aggregate multiple incoming flows with the same destination address into

a single outgoing flow. Where VC merge occurs, several incoming tags are mapped to one single

outgoing tag. Cells from different VCIs going to the same destination are transmitted to the same

outgoing VC using multipoint-to-point connections. This sharing of tags reduces the total number of

virtual circuits required for tag switching. Without VC merge, each source-destination prefix pair

consumes one tag VC on each interface along the path. VC merge reduces the tag space shortage by

sharing tags for different flows with the same destination.

VC merge support requires FC-PFQ on the route processor. If you do not have FC-PFQ, and you try to

enable VC merge, the TVCs remain point-to-point. (Catalyst 8510 MSR and LightStream 1010)

VC merge is enabled by default. To disable VC merge, enter the following command in global

configuration mode:

no tag-switching atm vc-merge

To display the VC merge configuration, use the following EXEC command:

show tag-switching atm-tdp capability

The following example shows that VC merge configuration is enabled on ATM interface 0/1/0:

Switch# show tag-switching atm-tdp capability

ATM Switch Router Software Configuration Guide

Configuring Tag Switching and MPLS

Disables VC merge.

Displays the TDP control channel

configuration on an interface.

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Catalyst 8510 msr Lightstream 1010