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## 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.

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