Modifying The Keepalive Interval - Cisco ASR 1000 Series Software Configuration Manual

Configuring the POS SPAs

Modifying the Keepalive Interval

When the keepalive feature is enabled, a keepalive packet is sent at the specified time interval to keep the
interface active. The keepalive interval must be configured to be the same on both ends of the POS link.
To modify the keepalive interval, use the following command in interface configuration mode:
Command
Router(config-if)# keepalive [period [retries ]]
To disable keepalive packets, use the no form of this command.
If keepalives are enabled and you are trying to configure line loopback on a POS interface, the keepalive
Note
protocol will fail and periodically reset the interface based on the keepalive timeout and cause Layer 1
errors on the other end of the link that is trying to do the loopbacks.You can avoid this by using the no
keepalive command on the POS interface that is configured for line loopback. The side that is not in line
loopback detects that its keepalive is being looped back and functions properly. An interface configured
for internal loopback also functions properly with keepalives enabled.
Verifying the Keepalive Interval
To verify the keepalive interval, use the show interfaces pos privileged EXEC command and observe the
value shown in the "Keepalive" field.
The following example shows that keepalive is enabled for interface port 0 on the POS SPA installed in subslot
0 of the SIP that is located in chassis slot 2 of the Cisco ASR 1000 Series Router:
Router# show interfaces pos 2/0/0
Hardware is Packet over SonetInternet address is 10.1.1.1.2MTU 9216 bytes, BW 622000 Kbit,
DLY 100 usec, reliability 255/255, txload 1/255, rxload 1/255
OL-14127-17
POS2/0/0 is up, line protocol is up
Keepalive set (10 sec.)
Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Software Configuration Guide, Cisco IOS XE
Modifying the Keepalive Interval
Purpose
Specifies the frequency at which the Cisco IOS
software sends messages to the other end of the link,
to ensure that a network interface is alive, where:
• period— Specifies the time interval in seconds
for sending keepalive packets. The default is 10
seconds.
• retries— Specifies the number of times that the
device will continue to send keepalive packets
without response before bringing the interface
down. The default is 5 retries.
Everest 16.5
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