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why bakebone fast cann't work with GEC(giga etnernet channel)?

two cat6513 and four cat4006

every 6513 have two WS-X6K-S2-MSFC2

one WS-X6516-GBIC

WS-X6348-RJ45V

every cat4006 have eng supIII

WS-X4148-RJ

every cat4006 G1/1 connect 6513A ;G1/2 connect 6513B

two cat6513 config GEC (3/1-2 port channel)

G3/1 G3/1

G3/2 G3/2

6513A ------------------ 6513B

GEC

4006 config:

spanning-tree uplinkfast

spanning-tree backbonefast

!

interface GigabitEthernet1/1

switchport trunk encapsulation isl

switchport mode trunk

description connect to 6513A

no snmp trap link-status

interface GigabitEthernet1/2

switchport trunk encapsulation isl

switchport mode trunk

description connect to 6513B

no snmp trap link-status

!

6513A config

#system

set system name 6513A

set system highavailability enable

#backbonefast

set spantree backbonefast enable

set trunk 3/1 on isl 1-1005,1025-4094

set trunk 3/2 on isl 1-1005,1025-4094

set trunk 3/3 on isl 1-1005,1025-4094

set trunk 3/4 on isl 1-1005,1025-4094

set trunk 3/5 on isl 1-1005,1025-4094

set trunk 3/6 on isl 1-1005,1025-4094

set trunk 3/7 on isl 1-1005,1025-4094

set port channel 3/1-2 mode on

set spantree root

6513B config

#system

set system name 6513B

set system highavailability enable

#backbonefast

set spantree backbonefast enable

set trunk 3/1 on isl 1-1005,1025-4094

set trunk 3/2 on isl 1-1005,1025-4094

set trunk 3/3 on isl 1-1005,1025-4094

set trunk 3/4 on isl 1-1005,1025-4094

set trunk 3/5 on isl 1-1005,1025-4094

set trunk 3/6 on isl 1-1005,1025-4094

set trunk 3/7 on isl 1-1005,1025-4094

set port channel 3/1-2 mode on

set spantree sec

I had trouble for all cat4006 CPU utilization was 99%!!!!

among of them

Cat4k Mgmt LoPri 70.44%

Spanning Tree 28.94%

MY operatetion :

I sent reset 1 on 6513A all is OK

but I sent reset 1 on 6513B

then the message is report the G3/1 and G3/2 all disconnet the Port-State 3/1-2 was not-connect!!!???

so I add a command set errdisable-timeout enable channel-misconfig on two 6513 ,late 30s the GEC Port-State is OK.

but now all the 4006 CPU utilization was 99%!!!!!!

final i remove backbone fast in all cat4006 .

all 4006 CPU utilization was 99% is fall to 5%.

then I add backbone fast cat4006 CPU utilization was 5% also,

but I try change the GEC port channel (set port channel 3/1-2 on change set port channel 3/1-2 desire)

right now the 4006 CPU utilization was up to 99%

my conclusion is when the GEC is change the cpu utilization is up to 99%

so I hvae two question !!!

fist : why I reset 6513A modu 1,then reset 6513B modu 1 ,the GEC change not-connect

two : cisco suggest all switch configure backbne fast,why now it is trouble.

1 REPLY
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Re: why bakebone fast cann't work with GEC(giga etnernet channel

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