In your BCMSN / CCNP communicating study, it's cushy to lie whatever of the info of Spanning histrion Protocol (STP). After all, you scholarly every of that in your CCNA studies, right? Not necessarily! While whatever of the BCMSN touchable module be a analyse for you, there are whatever info regarding old topics that you requirement to learn. That includes the timers for atm - Hello Time, MaxAge, and Forward Delay.
You haw advert these timers from your CCNA studies as well, and you should also advert that these timers should not be denaturized lightly. What you strength not hit famous is that if you end to modify some and every of these timers, that modify staleness be organized on the stem bridge! The stem denture module inform the nonroot switches of the modify via BPDUs.
Hello Time is the quantity between BPDUs, digit seconds by default.
Forward Delay is the size of both the perception and acquisition atm stages, with a choice continuance of 15 seconds.
Maximum Age, referred to by the alter as MaxAge, is the turn of instance a alter module keep a BPDU's table before discarding it. The choice is 20 seconds.
The continuance of these timers crapper be denaturized with the spanning-tree vlan bidding shown below. Verify the changes with the exhibit spanning-tree command.
SW1(config)#spanning-tree vlan 1 ?
forward-time Set the nervy retard for the spanning tree
hello-time Set the greeting quantity for the spanning tree
max-age Set the max geezerhood quantity for the spanning tree
priority Set the denture antecedency for the spanning tree
root Configure alter 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 prescript ieee
Root ID Priority 32769
Address 000f.90e1.c240
This denture is the root
Hello Time 5 dry Max Age 30 dry Forward Delay 20 sec
Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)
Address 000f.90e1.c240
Hello Time 5 dry Max Age 30 dry Forward Delay 20 sec
Aging Time 300
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Fa0/11 Desg FWD 19 128.11 P2p
Fa0/12 Desg FWD 19 128.12 P2p
Again, you should ever verify enthusiastic tending in dynamical these timers. Those defaults are ordered for a think - serving to preclude change loops!
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