16-8
ATM Switch Router Software Configuration Guide
OL-7396-01
Chapter 16
Configuring Tag Switching and MPLS
Configuring Tag Switching
IP tagging enabled
TSP Tunnel tagging not enabled
Tagging operational
MTU = 4470
ATM tagging: Tag VPI range = 5 - 6, Control VC = 6/32
<information deleted>
Configuring TDP Control Channels (Optional)
Although not necessary for most configurations, you can change the default Tag Distribution Protocol
(TDP) control channel VPI and virtual channel identifier (VCI) if you want to use a nondefault value.
The default TDP control channel is on VPI 0 and VCI 32. TDP control channels exchange TDP HELLOs
and Protocol Information Elements (PIEs) to establish two-way TDP sessions. TVCs are created by the
exchange of PIEs through TDP control channels.
To change the TDP control channel, perform the following steps, beginning in global configuration
mode:
Figure 16-1
shows an example TDP control channel configuration between a source switch and
destination switch on ATM interface 0/0/1. Note that the VPI and VCI values match on the source switch
and destination switch.
Figure 16-1 Configuring TDP Control Channels
Examples
In the following example, a TDP control channel is configured on the source switch:
Switch(config)#
interface atm 0/0/1
Switch(config-if)#
ip address 1.2.0.11 255.255.255.0
Switch(config-if)#
tag-switching ip
Switch(config-if)#
tag-switching atm control-vc 6 32
Switch(config-if)#
exit
In the following example, a TDP control channel is configured on the destination switch:
Switch(config)#
interface atm 0/0/1
Command
Purpose
Step 1
Switch(config)#
interface atm
card
/
subcard
/
port
Switch(config-if)#
Enters interface configuration mode on the
specified ATM interface.
Step 2
Switch(config-if)#
ip address
ip-address
mask
Assigns an IP address and subnet mask to the
ATM interface.
Step 3
Switch(config-if)#
tag-switching ip
Enables tag switching of IPv4 packets.
Step 4
Switch(config-if)#
tag-switching atm control-vc
vpi
vci
Changes the TDP control channel.
VPI = 6
VCI = 32
VPI = 6
VCI = 32
0/0/1
Source switch
Destination switch
S6806