From: Tarun Pahuja (pahujat@gmail.com)
Date: Wed Nov 14 2007 - 17:41:03 ART
Frog,
Port-channels basically aggregate bandwidth by bundling interfaces
together. Without them spanning-tree would treat the interfaces as separate
links and block redundant paths. Port-channels can be applied to
access-ports, trunk ports, layer 3 ports on a switch.
In your case is the router trying to get to the same vlan (svi interface) on
the core switch? or is it crossing vlan boundaries? that will decide if your
port-channel should be a bundle comprising of access ports in a specific
vlan or trunk ports carrying traffic for multiple vlans.
Important thing to notice also is that the "*interfaces in a port channel
must share the same speed and duplex, trunking encapsulation(if not trunking
- the same access vlan), the same STP cost per per VLAN, and no ports can
have SPAN configured." *
Useful Links:
http://www.cisco.com/en/US/products/hw/modules/ps2797/products_configuration_example09186a0080810449.shtml#step3
http://www.cisco.com/en/US/tech/tk389/tk213/technologies_configuration_example09186a0080094958.shtml
HTH,
Tarun
*
* On Nov 12, 2007 10:02 PM, Radioactive Frog <pbhatkoti@gmail.com> wrote:
> |CoreSw|------|Sw1|======|Sw2|------Router
> Vlan configured on coresw and want to extend to router.
>
> I am not sure if solution 1 or solution work or both will work?
> any comment appreciated..
>
> The question is about port channel between sw1 and sw2. End of the day
> router should be able to access the L3 interface (vlan10) created on the
> core-sw.
>
>
> Solution:1:
> ----------------
> interface Port-channel10
> description -- customer-a link --
> switchport mode access
> flowcontrol send off
> !
> interface FastEthernet0/10
> description -- link1 --
> switchport access vlan 22
> channel-group 10 mode active
> !
> interface FastEthernet0/11
> description -- LINK2----
> switchport access vlan 22
> channel-group 10 mode active
>
>
> OR OR OR OR OR
>
> Solution-2:
> ----------------
>
> interface Port-channel10
> description -- customer-a link --
> switchport access vlan 22
> flowcontrol send off
> !
> interface FastEthernet0/10
> description -- link1 --
> channel-group 10 mode active
> !
> interface FastEthernet0/11
> description -- LINK2----
> channel-group 10 mode active
>
>
>
>
> Frog
>
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