Gathering Mac Address Accounting Statistics; Configuring The Hot Standby Router Protocol; Verifying Hsrp - Cisco ASR 1000 Configuration Manual

Chapter 10 Configuring the Ethernet SPAs
Encapsulation ARPA, loopback not set
Keepalive not supported
Full-duplex, 1000Mb/s, link type is force-up, media type is SX
output flow-control is on, input flow-control is on
(Additional output removed for readability)

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
OL-14127-08
reliability 255/255, txload 1/255, rxload 1/255
Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Software Configuration Guide
Configuration Tasks
10-5