Gathering Mac Address Accounting Statistics - Cisco ASR 1000 Series Software Configuration Manual

Configuring the Ethernet SPAs

Gathering MAC Address Accounting Statistics

The ip accounting mac-address [input | output] command can be entered to enable MAC Address Accounting
on an interface. After enabling MAC Address Accounting, MAC address statistics can be displayed by entering
the show interfaces mac-accounting command.
Configuring the Hot Standby Router Protocol
The Hot Standby Router Protocol (HSRP) provides high network availability because it routes IP traffic from
hosts without relying on the availability of any single router. HSRP is used in a group of routers for selecting
an active router and a standby router. (An active router is the router of choice for routing packets; a standby
router is a router that takes over the routing duties when an active router fails, or when preset conditions are
met).
HSRP is enabled on an interface by entering the standby [group-number] ip [ip-address [secondary]]
command. The standby command is also used to configure various HSRP elements. This document does not
discuss more complex HSRP configurations. For additional information on configuring HSRP, refer to the
HSRP section of the Cisco IP Configuration Guide publication that corresponds to your Cisco IOS XE software
release. In the following HSRP configuration, standby group 2 on Gigabit Ethernet port 2/1/0 is configured
at a priority of 110 and is also configured to have a preemptive delay should a switchover to this port occur:
Router(config)#
interface GigabitEthernet 2/1/0
Router(config-if)#
standby 2 ip 120.12.1.200
Router(config-if)#
standby 2 priority 110
Router(config-if)#
standby 2 preempt
Verifying HSRP
To verify the HSRP information, use the show standby command in EXEC mode:
Router# show standby
Ethernet0 - Group 0
Local state is Active, priority 100, may preempt
Hellotime 3 holdtime 10
Next hello sent in 0:00:00
Hot standby IP address is 198.92.72.29 configured
Active router is local
Standby router is 198.92.72.21 expires in 0:00:07
Standby virtual mac address is 0000.0c07.ac00
Tracking interface states for 2 interfaces, 2 up:
UpSerial0
UpSerial1
Modifying the Interface MTU Size
The Cisco IOS software supports three different types of configurable maximum transmission unit (MTU)
options at different levels of the protocol stack:
• Interface MTU—Checked by the SPA on traffic coming in from the network. Different interface types
OL-14127-17
support different interface MTU sizes and defaults. The interface MTU defines the maximum packet
Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Software Configuration Guide, Cisco IOS XE
Gathering MAC Address Accounting Statistics
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