RE: Etherchannel issue...

This is brilliant - thanks a lot.

I have have made a .doc file & saved your comments - :)

thank you again.
________________________________________
From: shoaib mohammad [shoaibmohammad0_at_gmail.com]
Sent: Tuesday, 12 May 2009 9:39 PM
To: `yc `lepi
Cc: Jitendra Anbu; Nauman Habib; CCIE R/S, Groupstudy
Subject: Re: Etherchannel issue...

Hi,

1-you can not use 1 side Pagp and other side on it will not work.
2- make sure the duplex and speed both switches are auto or set to 100/100

Exchanging PAgP Packets
Both the auto and desirable PAgP modes allow interfaces to negotiate
with partner interfaces to determine if they can form an EtherChannel
based on criteria such as interface speed and, for Layer 2
EtherChannels, trunking state and VLAN numbers.

Interfaces can form an EtherChannel when they are in different PAgP
modes as long as the modes are compatible. For example:

An interface in the desirable mode can form an EtherChannel with
another interface that is in the desirable or auto mode.

An interface in the auto mode can form an EtherChannel with another
interface in the desirable mode.

An interface in the auto mode cannot form an EtherChannel with another
interface that is also in the auto mode because neither interface
starts PAgP negotiation.

An interface in the on mode that is added to a port channel is forced
to have the same characteristics as the already existing on mode
interfaces in the channel.

If your switch is connected to a partner that is PAgP-capable, you can
configure the switch interface for nonsilent operation by using the
non-silent keyword. If you do not specify non-silent with the auto or
desirable mode, silent mode is assumed.

The silent mode is used when the switch is connected to a device that
is not PAgP-capable and seldom, if ever, sends packets. An example of
a silent partner is a file server or a packet analyzer that is not
generating traffic. In this case, running PAgP on a physical port
connected to a silent partner prevents that switch port from ever
becoming operational; however, the silent setting allows PAgP to
operate, to attach the interface to a channel group, and to use the
interface for transmission.

see the below link for more about etherchannels and how it's work.

http://www.cisco.com/en/US/docs/switches/lan/catalyst3550/software/release/12.2_25_sec/configuration/guide/swethchl.html
http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.2_44_se/configuration/guide/swethchl.html

Regards,
SM

2009/5/12 `yc `lepi <eshedalonie_at_gmail.com>:
> *
> http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12
> .2_35_se/configuration/guide/swethchl.html#wp1276258
>
> on*b Forces the port to channel without PAgP or LACP. In the *on* mode, an
> EtherChannel exists only when a port group in the *on* mode is connected to
> another port group in the *on*mode.
>
> 2009/5/12 Jitendra Anbu <Jitendra.Anbu_at_optus.com.au>
>
>> Hi there,
>>
>>
>>
>> With PAgP couldnb t I run one end as mode ON? I am running L2 EC only. I
>> have not enabled trunking. I thought this will be negotiated automatically
>> (or am I wrong?).
>>
>>
>>
>> Thanks
>>
>>
>> Jit
>> ------------------------------
>> *From:* W W)W W W W W W [eshedalonie_at_gmail.com]
>> *Sent:* Tuesday, 12 May 2009 8:41 PM
>> *To:* Nauman Habib
>> *Cc:* Jitendra Anbu; CCIE R/S, Groupstudy
>> *Subject:* Re: Etherchannel issue...
>>
>> PAGP - Desirable can only negotiate Auto or Desirable.
>> ON Mode - is without negotiation.
>>
>> Second of all - Are you using ISL or 802.1Q mode ?
>>
>> On Tue, May 12, 2009 at 1:29 PM, Nauman Habib <mrnauman_at_gmail.com> wrote:
>>
>>> This seams to be an miss-configued error of Ether-channel
>>>
>>> can you please post your configs' of Port 23 & 24 for both switches
>>>
>>> Regards,
>>>
>>> Nauman
>>>
>>>
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Received on Tue May 12 2009 - 21:56:02 ART