Configuring A Timeout Period For Ports In Errdisable State - Cisco WS-C6506 Software Manual

Setting the Port Configuration
This example shows how to modify the port debounce timer setting on port 2/1:
Console> (enable) set port debounce 2/1 delay 500
Debounce time for port 2/1 set to 500 ms.
Warning:Enabling port debounce causes Link Up/Down detections to be delayed.
It results in loss of data traffic during debouncing period, which might
affect the convergence/reconvergence of various Layer 2 and Layer 3 protocols.
Use with caution.
Console> (enable)
This example shows how to display the per-port debounce timer setting on port 2/1:
Console> (enable) show port debounce 2/1
Port
-----
2/1
Console> (enable)

Configuring a Timeout Period for Ports in errdisable State

A port is in errdisable state if it is enabled in NVRAM but is disabled at runtime by any process. For
example, if UniDirectional Link Detection (UDLD) detects a unidirectional link, the port shuts down at
runtime. However, because the NVRAM configuration for the port is enabled (you have not disabled the
port), the port status is shown as errdisable.
If a port goes into errdisable state, it is reenabled automatically after a selected time interval. With the
timeout enhancement, you can manually prevent a port from being enabled by setting the errdisable
timeout for that port to disable using the set port errdisable-timeout mod/port disable command.
A global timer is maintained for all ports. At every t seconds, where t is the user-configurable timeout,
a process checks to see if any ports are in errdisable state. If there are ports in errdisable state, only those
ports that have errdisable timeout set (enabled) are reenabled through SCP messages.
By default, all errdisabled ports are reenabled when the global timer times out.
A port enters errdisable state for the following reasons (these reasons appear as configuration options
within the set errdisable-timeout enable command):
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Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
4-12
Chapter 4
Debounce link timer
-------------------
enabled (500 ms)
ARP inspection
Broadcast suppression
BPDU port-guard
CAM monitor
Channel misconfiguration
Crossbar failure
Duplex mismatch
Layer 2 protocol tunnel misconfiguration
Layer 2 protocol tunnel threshold exceeded
Layer 2 protocol tunnel CDP threshold exceeded
Layer 2 protocol tunnel STP threshold exceeded
Layer 2 protocol tunnel VTP threshold exceeded
Link errors RX threshold exceeded
Link errors TX threshold exceeded
Configuring Ethernet, Fast Ethernet, Gigabit Ethernet, and 10-Gigabit Ethernet Switching
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