Re: peculier high input errors on Cisco 4507 on etherchannel

haha... hey buddy.. you're still alive!

Looks like you're having issue with oversubscription and ASIC's are dropping
the traffic.
as u mentioned you've no errors on cat6500 and have on downstream swictch
4500 input error indicates:
Typically when cat65k pumps traffic and cat45xx has no RX buffer, it sends
pause frame to cat65xx telling stop pumping traffic for the period of X
amount of time. if cat65k has no flow control configured, it will simply
keep sending traffic to cat45k. that is whats happening in your case - yeah
your naughty cat65k is not accepting pause frame from cat45k.

So play with the flow control settings and you should be fine :)

HTH

frog

On Sat, Oct 2, 2010 at 9:49 PM, <subodh.rawat_at_wipro.com> wrote:

> Hi All,
>
> We are having some peculiar problem.
>
> We have two switches (Cisco 6509 as L3 and Cisco 4507 as L2) and L2
> ether-channel is formed between two switches with direct Cat6 cables
> (without
> any patch panel ports).
>
> When I see show interface output, I dont see any errors on 6509 switch port
> while high input errors are observed on 4507 switch ports.
>
> Below is show interface output and can see high input errors on 4507 and no
> errors on 6509-
>
> BRA-4507R-Access-3#sh int po 8 | in error
> 741322 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
> 0 output errors, 0 collisions, 0 interface resets
>
>
> BRA-6509-Core-1#sh int po 32 | in error
> 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
> 0 output errors, 0 collisions, 0 interface resets
>
> ------------------------------------
>
> My configuration on both the switches is as below -
> A) Core Switch (6509) -
>
> interface Port-channel32
> description ** Etherchannel#32, Gi3/2+Gi3/10+Gi7/2+Gi7/10 to BRA-Access-3,
> Etherchannel#8, Gi6/1+Gi6/2+Gi7/1+Gi7/2 **
> switchport
> switchport trunk encapsulation dot1q
> switchport trunk allowed vlan 12,13,16-19,25,26,30
> switchport mode trunk
> no ip address
> end
> !
> interface GigabitEthernet3/2
> description ** Etherchannel#32, to BRA-Access-3, Etherchannel#8 **
> switchport
> switchport trunk allowed vlan 12,13,16-19,25,26,30
> switchport mode trunk
> no ip address
> channel-group 32 mode on
> end
> BRA-6509-Core-1#sh run int g3/10
> Building configuration...
> Current configuration : 233 bytes
> !
> interface GigabitEthernet3/10
> description ** Etherchannel#32, to BRA-Access-3, Etherchannel#8 **
> switchport
> switchport trunk allowed vlan 12,13,16-19,25,26,30
> switchport mode trunk
> no ip address
> channel-group 32 mode on
> end
> BRA-6509-Core-1#sh run int g7/2
> Building configuration...
> Current configuration : 232 bytes
> !
> interface GigabitEthernet7/2
> description ** Etherchannel#32, to BRA-Access-3, Etherchannel#8 **
> switchport
> switchport trunk allowed vlan 12,13,16-19,25,26,30
> switchport mode trunk
> no ip address
> channel-group 32 mode on
> end
> BRA-6509-Core-1#sh run int g7/10
> Building configuration...
> Current configuration : 233 bytes
> !
> interface GigabitEthernet7/10
> description ** Etherchannel#32, to BRA-Access-3, Etherchannel#8 **
> switchport
> switchport trunk allowed vlan 12,13,16-19,25,26,30
> switchport mode trunk
> no ip address
> channel-group 32 mode on
> end
>
> B) Accesss Switch (4507) -
>
> BRA-4507R-Access-3#sh run int po8
> Building configuration...
> Current configuration : 273 bytes
> !
> interface Port-channel8
> description ** Etherchannel#8, Gi6/1+Gi6/2+Gi7/1+Gi7/2 to BRA-Core-1,
> Etherchan
> nel#32, Gi3/2+Gi3/10+Gi7/2+Gi7/10 **
> switchport
> switchport trunk encapsulation dot1q
> switchport trunk allowed vlan 12,13,16-19,25,26,30
> switchport mode trunk
> end
> BRA-4507R-Access-3#sh run int g6/1
> Building configuration...
> Current configuration : 240 bytes
> !
> interface GigabitEthernet6/1
> description ** Etherchannel#8, to BRA-Core-1, Etherchannel#32 **
> switchport trunk encapsulation dot1q
> switchport trunk allowed vlan 12,13,16-19,25,26,30
> switchport mode trunk
> channel-group 8 mode on
> end
> BRA-4507R-Access-3#sh run int g6/2
> Building configuration...
> Current configuration : 240 bytes
> !
> interface GigabitEthernet6/2
> description ** Etherchannel#8, to BRA-Core-1, Etherchannel#32 **
> switchport trunk encapsulation dot1q
> switchport trunk allowed vlan 12,13,16-19,25,26,30
> switchport mode trunk
> channel-group 8 mode on
> end
> BRA-4507R-Access-3#sh run int g7/1
> Building configuration...
> Current configuration : 240 bytes
> !
> interface GigabitEthernet7/1
> description ** Etherchannel#8, to BRA-Core-1, Etherchannel#32 **
> switchport trunk encapsulation dot1q
> switchport trunk allowed vlan 12,13,16-19,25,26,30
> switchport mode trunk
> channel-group 8 mode on
> end
> BRA-4507R-Access-3#sh run int g7/2
> Building configuration...
> Current configuration : 240 bytes
> !
> interface GigabitEthernet7/2
> description ** Etherchannel#8, to BRA-Core-1, Etherchannel#32 **
> switchport trunk encapsulation dot1q
> switchport trunk allowed vlan 12,13,16-19,25,26,30
> switchport mode trunk
> channel-group 8 mode on
> end
>
> -------------------------
>
> Total 4 Cat 6 cables are directly connected between these two switches and
> all
> ports are up with 1000/Full duplex.
>
> The same problem is coming on other etherchannels as well between Core
> switch
> and Access switch. However there is no errors between directly connected
> Access Switches (4507) ether channel.
>
> Please help me in understanding this issue.
>
> Regards,
> Subodh Rawat |
>
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Received on Sat Oct 02 2010 - 23:40:23 ART