Configure VGRP for Topology 2

In this topology, two switches are connected back-to-back using two ports on each switch. The spanning tree that is running in the switches is RSTP. Switch 2 is the root bridge in STP.

• Interface P1 and P2 in switch 1 and switch 2 must be enabled.

• VLAN must be configured.

See Example Topolgy 2 for the topology referenced in this procedure.

1. Review the spanning tree output in switch 2 (the root bridge).

   SEFOS# show spanning-tree
   Root Id         Priority   32768
   Address         00:14:4f:6c:61:cf
   Cost            0
   Port            0 [0]
   This bridge is the root
   Max Age 20 Sec, forward delay 15 Sec
    
   MST00
    
   Spanning tree Protocol has been enabled.
    
   MST00 is executing the mstp compatible Multiple Spanning Tree Protocol
   Bridge Id       Priority  32768
   Address  00:14:4f:6c:61:cf
   Max age is 20 sec, forward delay is 15 sec
   Dynamic Path Cost is Disabled
   Name     Role         State        Cost     Prio   Type
   ----     ----         -----        ----     ----   ------
   Ex0/3    Designated   Forwarding   2000     128    P2P
   Ex0/15   Designated   Forwarding   2000     128    P2P
   Ex0/16   Designated   Forwarding   2000     128    P2P
   Ex0/19   Designated   Forwarding   2000     128    P2P
   Ex0/22   Designated   Forwarding   2000     128    P2P

2. Review the spanning tree output in switch 1 (the nonroot bridge).

   SEFOS# show spanning-tree
   Root Id         Priority   32768
    Address    00:14:4f:6c:61:cf
   Cost       2000
   Port       3 [Ex0/3]
   Max age 20 Sec, forward delay 15 Sec
    
   MST00
    
   Spanning tree Protocol has been enabled
    
   MST00 is executing the mstp compatible Multiple Spanning Tree Protocol
   Bridge Id       Priority 32768
   Address 00:21:28:56:d7:a9
   Max age is 20 sec, forward delay is 15 sec
   Dynamic Path Cost is Disabled
   Name              Role         State        Cost     Prio   Type
   ----              ----         -----        ----     ----   ------
   Ex0/3             Root         Forwarding   2000     128    P2P
   Ex0/15            Designated   Forwarding   2000     128    P2P
   Ex0/19            Designated   Forwarding   2000     128    P2P
   Ex0/21            Designated   Forwarding   2000     128    P2P

3. Create VLAN 2 on switch 2 (the root bridge), and review the VLAN database details.

   SEFOS# configure terminal
   SEFOS(config)# vlan 2
   SEFOS(config-vlan)# ports extreme-ethernet 0/3
   SEFOS(config-vlan)# exit
   SEFOS(config)# exit
   SEFOS# show vlan
   Vlan database
   -------------
   Vlan ID             : 1
   Member Ports        : Ex0/1, Ex0/2, Ex0/3, Ex0/4, Ex0/5, Ex0/6
   Ex0/7, Ex0/8, ...
   Untagged Ports      : Ex0/1, Ex0/2, Ex0/3, Ex0/4, Ex0/5, Ex0/6
   Ex0/7, Ex0/8, ...
   Forbidden Ports     : None
   Name                :
   Status              : Permanent
   ----------------------------------------------------
   Vlan ID             : 2
   Member Ports        : Ex0/3
   Untagged Ports      : None
   Forbidden Ports     : None
   Name                :
   Status              : Permanent
   ------------------------------------------

4. Review the new VLAN output on switch 2 (the nonroot bridge).

   SEFOS# show vlan
   Vlan database
   -------------
   Vlan ID             : 1
   Member Ports        : Ex0/1, Ex0/2, Ex0/3, Ex0/4, Ex0/5, Ex0/6
   Ex0/7, Ex0/8, ...
   Untagged Ports      : Ex0/1, Ex0/2, Ex0/3, Ex0/4, Ex0/5, Ex0/6
   Ex0/7, Ex0/8, ...
   Forbidden Ports     : None
   Name                :
   Status              : Permanent
   ----------------------------------------------------
   Vlan ID             : 2
   Member Ports        : Ex0/3, Ex0/4
   Untagged Ports      : None
   Forbidden Ports     : None
    
   Name                :
   Status              : Dynamic Gvrp
   -------------------------------------------------

   The switch propagates the VLAN declaration or registration on all the forwarding ports in the switch. In the preceding example, when VLAN 2 was created on the root bridge (switch 2), the switch propagated this information on all of the forwarding ports (Ex0/3 and Ex0/4), thus allowing switch 1 to learn about VLAN 2 through two ports (Ex0/3 and Ex0/4) using GVRP.