16-4
ATM Switch Router Software Configuration Guide
OL-7396-01
Chapter 16
Configuring Tag Switching and MPLS
Configuring Tag Switching
Internet address is 1.0.1.11/24
MTU 1500 bytes, BW 8000000 Kbit, DLY 5000 usec, rely 255/255, load 1/255
Encapsulation LOOPBACK, loopback not set, keepalive set (10 sec)
Last input 00:00:03, output never, output hang never
Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/0, 0 drops; input queue 0/75, 0 drops
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
0 packets input, 0 bytes, 0 no buffer
Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
73 packets output, 0 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 output buffer failures, 0 output buffers swapped out
Enabling Tag Switching on the ATM Interface
Note
Configure all parallel interfaces between ATM switch routers for either IP unnumbered or with a specific
IP address. Unnumbering some parallel interfaces and assigning specific IP addresses to others might
cause TDP sessions to restart on some parallel interfaces when another parallel interface is shut down.
Therefore, we highly recommend that you unnumber all parallel interfaces to loopback.
To enable tag switching on the ATM interface, perform the following steps, beginning in global
configuration mode:
Examples
In the following example, ATM interface 1/0/1 is configured for IP unnumbered to loopback interface 0:
Switch(config-if)#
interface atm 1/0/1
Switch(config-if)#
ip unnumbered loopback 0
Switch(config-if)#
tag-switching ip
Switch(config-if)#
exit
In the following example, ATM interface 0/0/3 is configured with a specific IP address and subnet mask
(1.3.11.3 255.255.0.0):
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 unnumbered
type
number
or
Switch(config-if)#
ip address
ip-address
mask
Enables IP unnumbered on the ATM interface and
assigns the unnumbered interface to an interface
that has an IP address. We recommend enabling
IP unnumbered because it allows you to conserve
IP addresses and it reduces the number of TVCs
terminating on the switch.
or
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.