[c-nsp] 7200 - G1 PortChan MTU

[CiscoNSP List]

Tested this "issue" on a spare 7200/G1, and this was the result:

Couldnt change mtu on physical ints to 1500(i.e. It remained as 1998, but didnt throw an error/complain), without first changing them to something other than 1500 (i.e. mtu 1997), then was able to change them to 1500.

Once physical ints were @1500, I still couldnt change the portchan to 1998 (Threw the same "% At least one member of the channel group 1 is not a 2FE port adapter" error)

Only solution was to default the physical Ints, change the mtu on the the portchan to 1998, and then add the physical Ints back to the portchan, and then all is happy @ 1998.


> From: cisconsp_list at hotmail.com
> To: randy_94108 at yahoo.com; cisco-nsp at puck.nether.net
> Date: Sun, 21 Jul 2013 14:35:13 +1030
> Subject: Re: [c-nsp] 7200 - G1 PortChan MTU
> 
> Both phys-ints are showing 1500byte mtu, as is portchan
> 
> #sh int gigabitEthernet 0/1
> GigabitEthernet0/1 is up, line protocol is up 
>   Hardware is BCM1250 Internal MAC, address is 00d0.bc5b.bc1b (bia 00d0.bc5b.bc1b)
>   Description: GEC_TO_CSW01_24
>   MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec, 
>      reliability 255/255, txload 6/255, rxload 5/255
> 
> #sh int gigabitEthernet 0/3
> GigabitEthernet0/3 is down, line protocol is down 
>   Hardware is BCM1250 Internal MAC, address is 00d0.bc5b.bc1b (bia 00d0.bc5b.bc19)
>   Description: GEC_TO_CSW02_24
>   MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec, 
>      reliability 254/255, txload 1/255, rxload 1/255
> 
> #sh int port-channel 1
> Port-channel1 is up, line protocol is up 
>   Hardware is GEChannel, address is 00d0.bc5b.bc1b (bia 00d0.bc5b.bc1b)
>   MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec, 
>      reliability 255/255, txload 10/255, rxload 5/255
> 
> 
> Phys-int conf:
> 
> interface GigabitEthernet0/1
>  description GEC_TO_CSW01_24
>  mtu 1998
>  no ip address
>  ip mtu 1998
>  ip flow ingress
>  duplex auto
>  speed auto
>  media-type rj45
>  no negotiation auto
>  channel-group 1
> end
> 
> And portchan1:
> 
> interface Port-channel1 no ip address
>  ip access-group 103 in
>  ip flow ingress
>  load-interval 30
>  duplex full
> end
> 
> 
> 
> 
> Date: Sat, 20 Jul 2013 20:42:39 -0700
> From: randy_94108 at yahoo.com
> Subject: Re: [c-nsp] 7200 - G1 PortChan MTU
> To: cisconsp_list at hotmail.com; cisco-nsp at puck.nether.net
> 
> what is the output fo sh int for phy-ints and sho int po(x)
> 
>         From: CiscoNSP List <cisconsp_list at hotmail.com>
>  To: "randy_94108 at yahoo.com" <randy_94108 at yahoo.com>; "cisco-nsp at puck.nether.net" <cisco-nsp at puck.nether.net> 
>  Sent: Saturday, July 20, 2013 8:22 PM
>  Subject: RE: [c-nsp] 7200 - G1 PortChan MTU
>    
> 
> 
> 
> 
> 
> Both member Ints have the same conf (i.e. both have mtu of 1998) - It's only the portchan that doesnt have an mtu set (So is defaulting to 1500)?
> 
> 
> 
> 
> > Date: Sat, 20 Jul 2013 19:42:31 -0700
> > From: randy_94108 at yahoo.com
> > Subject: Re: [c-nsp] 7200 - G1 PortChan MTU
> > To: cisconsp_list at hotmail.com; cisco-nsp at puck.nether.net
> > 
> > it doesn't matter that the second phyical-member of this port channel is disconnected. It is still a member of this bundle. UP mtu of inactive phy-member to 1998 and then up mtu of port-channel.
> > ./Randy
> > 
> > 
> > 
> > ----- Original Message -----
> > > From: CiscoNSP List <cisconsp_list at hotmail.com>
> > > To: "cisco-nsp at puck.nether.net" <cisco-nsp at puck.nether.net>
> > > Cc: 
> > > Sent: Saturday, July 20, 2013 7:20 PM
> > > Subject:
>  [c-nsp] 7200 - G1 PortChan MTU
> > > 
> > > Hi,
> > > 
> > > Have a G1, with one active Gig port in a portchan (Second member is currently 
> > > disconnected, but is also a Gig port on the G1) - No other ports are configured 
> > > as member ports.
> > > 
> > > Gi0/1 (Active member) has an mtu of 1998 - Portchan doesnt have an mtu 
> > > configured (So is defaulting to 1500)
> > > 
> > > Attempting to change the mtu on the portchan, I get the following:
> > > 
> > > (config)#interface Port-channel1(config-if)#mtu 1998               % At least 
> > > one member of the channel group 1 is not a 2FE port adapter
> > > 
> > > Any suggestions why this is happening? 
> > > 
> > > And I assume the only way to resolve this is to default the member ints, re-add 
> > > them to the portchan and then
>  change the mtu on the portchan?
> > > 
> > > Cheers.
> > > 
> > > 
> > >                           
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> > > cisco-nsp mailing list  cisco-nsp at puck.nether.net
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> > > 
>  		 	   		  
> 
> 
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