Cisco 15327 - Manual (Page 77)

4-11
Ethernet Card Software Feature and Configuration Guide, R7.2
Chapter 4 Configuring Interfaces
CRC Threshold Configuration
To configure the IP address, bridge group, or encapsulation for the POS interface, perform the following
procedure, beginning in global configuration mode:
CRC Threshold Configuration
You can configure a span shutdown when the ML-Series card receives CRC errors at a rate that exceeds
the configured threshold and configured soak time. ML cards support CRC threshold configuration
functionality on FE / GE / POS and RPR-IEEE interfaces. For configuration sample for RPR IEEE
interfaces, see
Chapter 26, “Configuring IEEE 802.17b Resilient Packet Ring.”
To enable and configure the triggers for CRC errors on POS , perform the following procedure,
beginning in global configuration mode:
Command Purpose
Step 1 Router(config)# interface pos number Activates interface configuration mode to
configure the POS interface.
Step 2 Router(config-if)# {ip address ip-address
subnet-mask | bridge-group
bridge-group-number}
Sets the IP address and subnet mask.
or
Assigns a network interface to a bridge group.
Step 3 Router(config-if)# shutdown Manually shuts down the interface. Encapsulation
changes on POS ports are allowed only when the
interface is shut down (ADMIN_DOWN).
Step 4 Router(config-if)# encapsulation type Sets the encapsulation type. Valid values are:
• hdlc—Cisco HDLC
• lex—(Default) LAN extension, special
encapsulation for use with Cisco ONS
Ethernet line cards
• ppp—Point-to-Point Protocol
Step 5 Router(config-if)# no shutdown Restarts the shutdown interface.
Step 6 Router(config)# end Returns to privileged EXEC mode.
Step 7 Router# copy running-config startup-config (Optional) Saves configuration changes to
NVRAM.
Command Purpose
Step 1 Router(config)#int pos0
Router(config-if)#trigger crc-error
threshold <threshold_value>
Sets the CRC threshold value. If the percentage of
CRC errored frames received on this interface is
greater than this value, we consider this interface
as seeing excessive CRC. The valid values are 2, 3
and 4 indicating thresholds of 10e-2 (1%),
10e-3(0.1%) and 10e-4(.01%). The default value
is 3.
Step 2 Router(config-if)#no trigger crc-error
threshold < threshold_value>
Sets the threshold value back to the default value
3.