"%L2_AGING-SP-2-DEC_EN_FAIL: Failed to initialize Distributed EtherChannel" Errors in Cisco IOS 
Bug ID:
CSCse87210
Resolved In:
12.2(18)SXF7 and later releases of Cisco IOS
Symptom:
%L2_AGING-SP-2-DEC_EN_FAIL: Failed to initialize Distributed EtherChannel %L2_AGING-SP-2-DEC_EN_FAIL: Failed to initialize Distributed EtherChannel %L2_AGING-SP-2-DEC_EN_FAIL: Failed to initialize Distributed EtherChannel
Conditions:
This was observed only on Cisco Catalyst 6500 switches running native Cisco IOS software.
Workaround:
There are two core triggers of this error;
1. When one or more resources that are required for the Distributed EtherChannel (DEC) operation are in use by other modules, e.g. a Firewall Services Module (FWSM) or
2. When a mixture of both Crossbar and Bus mode are in use in the same chassis as shown:
Catalyst-6509-Switch# show fabric switching-mode [module {slot_number | all]
Global switching mode is Truncated
dCEF mode is not enforced for system to operate
Fabric module is not required for system to operate
Modules are allowed to operate in bus mode
Truncated mode is allowed, due to presence of CEF720 module
Module Slot Switching Mode
1 Crossbar
3 Crossbar
4 Crossbar
5 Bus
6 Crossbar
7 Crossbar
8 Crossbar
9 Bus
In Bus mode, packets are broadcast to all linecards while in Crossbar mode, packets are unicast directly to the specific linecards.
Workarounds
The workaround for the first scenario above is to remove the monitor session reserved for service modules. In order to do this, issue the no monitor session servicemodule command, and then reinitialize the operation. This disables the internal-span required by the FWSM to process multicast traffic, which in turn frees the resources on the SPAN-ASIC in order to allow DEC to work.
The workaround for the second scenario above is to change the mode of the modules to bus mode. In order to force fabric-enabled modules into bus switching mode, use the fabric switching-mode force bus-mode IOS command.
Solution:
Upgrade to Cisco IOS Software Release 12.2(18)SXF7 or later to fix this defect. Note that CSCse87210 - Enable service cards to operate in crossbar mode with Dist Etherchannels - is also fixed in 12.2(33)SXH and beyond
Type: Bug - Archive ID: 1.15463 - 423 Views - Last Updated: February 11, 2009 20:15
Tags: 802.3ad cat6000-l2 cisco error etherchannel lan switching syslog cat6k