3Com 3CRWX120695A, Configuration Manual

Page: 358 / 728

358 C
HAPTER
17: C
ONFIGURING AND
M
ANAGING
S
PANNING
T
REE
P
ROTOCOL
The all option applies the change to all VLANs. Alternatively, specify an
individual VLAN.
To change the forwarding delay on VLAN pink to 20 seconds, type the
following command:
WX1200# set spantree fwddelay 20 vlan pink
success: change accepted.
Changing the STP Maximum Age
To change the maximum age, use the following command:
set spantree maxage aging-time { all | vlan vlan-id }
Specify an age from 6 through 40 seconds. The default is 20 seconds.
The all option applies the change to all VLANs. Alternatively, specify an
individual VLAN.
To change the maximum acceptable age for root bridge hello packets on
all VLANs to 15 seconds, type the following command:
WX1200# set spantree maxage 15 all
success: change accepted.
Configuring and
Managing STP Fast
Convergence
Features
The standard STP timers delay traffic forwarding briefly after a topology
change. The time a port takes to change from the listening state to the
learning state or from the learning state to the forwarding state is called
the forwarding delay. In some configurations, this delay is unnecessary.
The WX switch provides the following fast convergence features to
bypass the forwarding delay:
„
Port fast
„
Backbone fast
„
Uplink fast
Port Fast
Convergence
Port fast convergence bypasses both the listening and learning stages and
immediately places a port in the forwarding state. You can use port fast
convergence on ports that are directly connected to servers, hosts, or
other MAC stations.
Do not use port fast convergence on ports connected to other bridges.