24
Cisco 10008 Router PRE4 Installation and Configuration Guide
OL-13840-01
Forcing Failover in a Redundant Pair
Example 4
Show SSM Codes Received
router#
sh network-clocks ssm
SSM Codes:
S/SS Clock Source Source Card Rcv SSM (code)
-/- Slot pre-a loc PRE n/a (0xFF)
1/0 none 4jacket-1 n/a (0xFF)
7/0 T3 7/0/0 4cht3-hh-1 n/a (0xFF)
7/1 Serial7/1/0/1:0 4cht3-hh-1 n/a (0xFF)
Example 5
PRE4 T1 BITS Input Configuration
Router(config)#
network-clock select 6 slot pre-a t1 ?
esf ESF Framing
sf SF Framing
Router(config)#
network-clock select 6 slot pre-a t1 esf ?
ami AMI Line Coding
b8zs B8ZS Line Coding
Example 6
PRE4 E1 BITS Input Configuration
Router(config)#
network-clock select 6 slot pre-a e1 ?
crc4 CRC4 Framing
no-crc4 No CRC4 Framing
Router(config)#
network-clock select 6 slot pre-a e1 crc4 ?
ami AMI Line Coding
hdb3 HDB3 Line Coding
Forcing Failover in a Redundant Pair
To manually force the active and standby devices in a redundant pair to failover, use the
redundancy
force-switchover main-cpu
command. Manually force the active and standby PRE4 to reverse roles if
you need to replace the active one. You can then replace the PRE4 while causing only minimal disruption
of traffic.
The following example shows how to set the standby PRE4 to be active:
Router#
redundancy force-switchover main-cpu
This command does not generate an alarm.
Managing System Boot Parameters
During the boot process, the system reads a software configuration register that defines certain system
parameters. The software configuration register is a 16-bit register in NVRAM used to define such
characteristics as:
•
The source of the Cisco IOS software image required to run the router
•
Whether the system software should ignore the contents of NVRAM