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Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Software Configuration Guide
OL-14127-08
Chapter 10 Configuring the Ethernet SPAs
Configuration Tasks
Interface MTU Configuration Task
To modify the MTU size on an interface, use the following command in interface configuration mode:
To return to the default MTU size, use the no form of the command.
Verifying the MTU Size
To verify the MTU size for an interface, use the show interfaces gigabitethernet privileged EXEC
command and observe the value shown in the “MTU” field.
The following example shows an MTU size of 1500 bytes for interface port 1 (the second port) on the
Gigabit Ethernet SPA installed in the top subslot (0) of the SIP that is located in slot 2 of the Cisco ASR
1000 Series Router:
Router# show interfaces gigabitethernet 2/0/1
GigabitEthernet2/0/1 is up, line protocol is up
Hardware is SPA-1X10GE-L-V2, address is 000a.f330.2e40 (bia 000a.f330.2e40)
Internet address is 2.2.2.1/24
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive not supported
QoS Classification
The physical level interface module (PLIM) is the hardware component in the data path between the
media interface and the forwarding engine.
Command Purpose
Router(config-if)# mtu bytes Configures the maximum packet size for an interface,
where:
• bytes—Specifies the maximum number of bytes for
a packet.
The default is 1500 bytes and the maximum
configurable MTU is 9216 bytes.
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