Cisco ASR 1000 Series Software Configuration Guide

PurposeCommand or Action
(Optional) Configures the MTU value, in bytes, for IP packets on this interface.
The valid range for an ATM SPA is 64 to 9288, with a default value equal to the
MTU value configured in Step 2.
Router(config-if)# ip mtu bytes
Example:
Step 3
(Optional) Configures the MTU value, in bytes, for MPLS-labeled packets on
this interface. The valid range for an ATM SPA is 64 to 9216 bytes, with a default
value equal to the MTU value configured in Step 2.
Router(config-if)# mpls mtu bytes
Example:
Step 4
Exits interface configuration mode and returns to privileged EXEC mode.Router(config-if)# end
Example:
Step 5
Verifying the MTU Size
To verify the MTU sizes for an interface, use the show interfaces, show ip interface, and show mpls interface
commands, as in the following examples:
The output of the show interfaces atm command can display configuration of AAL5 encapsulation, but
only AAL0 is supported on the Cisco ASR 1000 Series Aggregation Services Routers.
Note
Router# show interfaces atm 0/2/2
ATM0/2/2 is up, line protocol is up
Hardware is SPA-3XOC3-ATM-V2, address is 001a.3044.7522 (bia 001a.3044.7522)
MTU 4470 bytes, sub MTU 4470, BW 149760 Kbit, DLY 80 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ATM, loopback not set
Keepalive not supported
Encapsulation(s): AAL5 AAL0
4095 maximum active VCs, 1 current VCCs
VC Auto Creation Disabled.
VC idle disconnect time: 300 seconds
4 carrier transitions
Last input never, output 00:04:11, output hang never
Last clearing of "show interface" counters never
Input queue: 0/375/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 0 bits/sec, 0 packets/sec
5 packets input, 540 bytes, 0 no buffer
Received 0 broadcasts (0 IP multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
5 packets output, 540 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 output buffer failures, 0 output buffers swapped out
Router# show ip interface atm 0/2/2.1
ATM0/2/2.1 is up, line protocol is up
Internet address is 10.4.0.2/24
Broadcast address is 255.255.255.255
Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Software Configuration Guide, Cisco IOS XE
Everest 16.5
OL-14127-17 65
Configuring the ATM SPAs
Modifying the Interface MTU Size

Cisco ASR 1000 Series Specifications

General

Brand	Cisco
Model	ASR 1000 Series
Category	Network Router
Language	English