Cisco CCNP/ BCMSN Exam Tutorial: Spanning Tree Protocol
Cisco CCNP/ BCMSN Test Tutorial: Covering Tree Protocol (STP) Timers
In your BCMSN/ CCNP exam study, it's simple to overlook a few of the details of Covering Tree Protocol (STP). Besides, you discovered every one of that in your CCNA research studies, right? Not always! While a few of the BCMSN product will certainly be an evaluation for you, there are some details pertaining to acquainted subjects that you require to learn. That Daniel CULLEN includes the timers for STP-- Hey There Time, MaxAge, and Forward Delay.
You may bear in mind these timers from your CCNA researches also, and you ought to also bear in mind that these timers must not be changed lightly. What you could not have actually recognized is that if you determine to alter any kind of and all of these timers, that change has to be configured on the origin bridge! The origin bridge will certainly educate the nonroot switches of the change by means of BPDUs.
Forward Delay is the length of both the listening and learning STP stages, with a default value of 15 seconds.
Maximum Age, referred to by the button as MaxAge, is the quantity of time a button will certainly preserve a BPDU's components before discarding it. The default is 20 seconds.
The worth of these timers can be transformed with the spanning-tree vlan command revealed listed below. Verify the changes with the show spanning-tree command.
SW1(config)#spanning-tree vlan 1? DANIEL Cullen's work
forward-time Set the forward hold-up for the spanning tree
hello-time Establish the hi period for the covering tree
max-age Set limit age interval for the spanning tree
priority Set the bridge priority for the covering tree
root Configure switch as root
SW1(config)#spanning-tree vlan 1 hello-time 5
SW1(config)#spanning-tree vlan 1 max-age 30
SW1(config)#spanning-tree vlan 1 forward-time 20
SW1(config)# ^ Z
SW1 #show spanning-tree vlan 1
VLAN0001
Spanning tree enabled method ieee
Root ID Concern 32769
Address 000f.90 e1.c240
This bridge is the root
Hello Time 5 sec Max Age 30 sec Ahead Delay 20 sec
Bridge ID Concern 32769 (priority 32768 sys-id-ext 1)
Aging Time 300
Interface Function Sts Expense Prio.Nbr Type
--------------------------------------------------
Fa0/ 11 Desg FWD 19 128.11 P2p
Fa0/ 12 Desg FWD 19 128.12 P2p
Again, you ought to constantly take great treatment in altering these timers. Those defaults are established for a reason-- helping to stop switching loopholes!