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MAGNUM 6K SWITCHES, MNS-6K USER GUIDE
Root Path Cost: a path cost is assigned to individual ports for the switch to determine which
ports are the forwarding points. A higher cost means more loops; a lower cost means fewer loops.
More loops equal more traffic and a tree which takes a long time to converge – resulting in a
slower system
Designated Root: shows the MAC address of the bridge in the network elected or designated as
the root bridge.
Designated Root Priority: shows the designated root bridge’s priority. Default value is 0
Root Bridge Forward Delay: indicates the designated root bridge’s forward delay. This is the
time the switch waits before it switches from the listening to the forwarding state. The default is
15 seconds. This value can be set between 4-30 seconds
Root Bridge Hello Time: indicates the designated root bridge’s hello time. Hello information is
sent out every 2 seconds
Root Bridge Max Age: indicates the designated root bridge’s maximum age – after which it
discards the information as being old and receives new updates
Topology Change count: since the last reboot, the number of times the topology has changed.
Use this in conjunction with “show uptime” to find the frequency of the topology changes
Time Since topology Change: number of seconds since the last topology change
Magnum6K25(rstp)## show rstp ports
RSTP Port Configuration
----------------------------------------------------------------------------------------------------------------
Port# Type Priority Path Cost State Des. Bridge Des. Port
----------------------------------------------------------------------------------------------------------------
09 TP(10/100) 128 2000000 Forwarding 00:00:00:20:06:25:ed:89 00:09
10 TP(10/100) 128 2000000 Disabled 00:0a
11 TP(10/100) 128 2000000 Disabled 00:0b
12 TP(10/100) 128 2000000 Disabled 00:0c
13 TP(10/100) 128 200000 Forwarding 00:00:00:20:06:25:ed:89 00:0d
14 TP(10/100) 128 2000000 Disabled 00:0e
15 TP(10/100) 128 2000000 Disabled 00:0f
16 TP(10/100) 128 2000000 Disabled 00:10
Magnum6K25(rstp)##
FIGURE 88 – Reviewing the RSTP port parameters
The variables listed by the “show stp config” command are:
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