RE: peculier high input errors on Cisco 4507 on etherchannel

Thanx buddy...will play with flow control...

Yeah...very much alive..but due to hectic work bot able to participate
actively in GS.

Regards,
Subodh Rawat

-----Original Message-----
From: Radioactive Frog [mailto:pbhatkoti_at_gmail.com]
Sent: Sat 02/10/2010 2:40 PM
To: Subodh Singh Rawat (WT01 - Energy and Utilities)
Cc: ccielab_at_groupstudy.com
Subject: Re: peculier high input errors on Cisco 4507 on etherchannel with
cisco 6509

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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Wipro Limited (Company Regn No in UK FC 019088)
Address: Level 2, West wing, 3
Sheldon Square, London W2 6PS, United Kingdom. Tel +44 20 7432 8500 Fax: +44
20 7286 5703

VAT Number: 563 1964 27

(Branch of Wipro Limited (Incorporated
in India at Bangalore with limited liability vide Reg no L99999KA1945PLC02800
with Registrar of Companies at Bangalore, India. Authorized share capital Rs
5550 mn))

Please do not print this email unless it is absolutely necessary.
The information contained in this electronic message and any attachments to
this message are intended for the exclusive use of the addressee(s) and may
contain proprietary, confidential or privileged information. If you are not
the intended recipient, you should not disseminate, distribute or copy this
e-mail. Please notify the sender immediately and destroy all copies of this
message and any attachments.

WARNING: Computer viruses can be transmitted
via email. The recipient should check this email and any attachments for the
presence of viruses. The company accepts no liability for any damage caused by
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Received on Mon Oct 04 2010 - 08:15:56 ART