Re: ISL / DOT1Q Load Balancing

Donald,

You can still use per-vlan STP to load share and achieve redundancy:

SW3-----dot1q---SW4 (port 19)
SW3-------isl------SW4 (port 20)

Here vlan 3 will pass over the dot1q trunk and vlan 4 over the isl trunk:

SW4:

interface FastEthernet0/19
 switchport trunk encapsulation dot1q
 switchport mode trunk
 spanning-tree vlan 3 port-priority 0
interface FastEthernet0/20
 switchport trunk encapsulation isl
 switchport mode trunk
 spanning-tree vlan 4 port-priority 0

Sw3#sho int trunk
Port Mode Encapsulation Status Native vlan
Fa0/19 on 802.1q trunking 1
Fa0/20 on isl trunking 1

Sw3#sho span vlan 3
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- --------
--------------------------------
Fa0/19 Root FWD 19 128.19 P2p
Fa0/20 Altn BLK 19 128.20 P2p

Sw3#sho span vlan 4
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- --------
--------------------------------
Fa0/19 Altn BLK 19 128.19 P2p
Fa0/20 Root FWD 19 128.20 P2p

On Tue, Sep 15, 2009 at 5:15 PM, Donald Virgil <d.virgil88_at_gmail.com> wrote:

> How can load balancing across ISL and DOT1Q trunks be accomplished? Not
> the
> automagicaly kind, I want to control what VLAN's travel over what link all
> the time.
>
>
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-- 
Bryan Bartik
CCIE #23707 (R&S), CCNP
Sr. Support Engineer - IPexpert, Inc.
URL: http://www.IPexpert.com
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