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STP configuration compared to Cisco


Hi

I am sorry to ask very basic question but somehow I was not able to find exact answer :

1) In extreme switches ; by default is STP enabled and running ? I mean if i dont do any configuration
stpd s0 runs on all the ports ? Is it default 802.1D flavor ?

2) I am somehow confused about configure stpd default-encap < > command . Can you please explain the usage.

3) I Intend to use PVST+ . My impression from Cisco switches is that in case you enabled mode to pvst ,it creates a instance of stp for all vlans present in switch . Is this same for extreme as well ..

I am planning following config :

create stpd s1
configure stpd s1 mode pvst-plus
configure stpd s1 default-encapsulation pvst-plus
configure stpd s1 add vlan ONM ports < > pvst-plus
enable stpd s1

My query is on command # 4
a) Basically I am creating a instance of pvst+ for vlan ONM .. for "N" number of vlans ; I have to repeat this command "N" number of times ?
b) Am I supposed to explicitly mention ports in vlan ONM ? If at a later stage I bring up additional trunk with ONM vlan allowed ; I am supposed to edit this command each time ?

Please let me know

1 reply

Userlevel 4
1. No, it's disabled by default. If you enable the 's0' stp domain, only 'default' vlan will be automatically part of it by auto-bind by default.

2. This command is to configure which type of BPDU packets will be sent out of a port in a vlan. For PVST+, untagged ports should be 'dot1d' encapsulation type and tagged ports should be 'pvst-plus' encapsulation type.

# create vlan ONM tag 100
# configure vlan ONM add port 1 2 tagged
# configure vlan ONM add port 3 4 untagged

# create stpd s1
# configure stpd s1 mode dot1w # This is for RSTP
# configure stpd s1 add vlan ONM ports 1 2 pvst-plus
# configure stpd s1 add vlan ONM ports 3 4 dot1d
# configure stpd s1 tag 100
# enable stpd s1

3. You need to create an individual stp domain for every VLAN.

4. You could use the 'auto-bind' feature to add ports into a corresponding stp domain automatically.

# configure stpd s1 default-encapsulation pvst-plus
# enable stpd s1 auto-bind vlan ONM

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