In your BCMSN / CCNP exam study, it's easy to overlook some of the details of Spanning Tree Protocol (STP). After all, you learned all of that in your CCNA studies, right? Not necessarily! While some of the BCMSN material will be a review for you, there are some details regarding familiar topics that you need to learn. That includes the timers for STP - Hello Time, MaxAge, and Forward Delay.
Laptop Battery You may remember these timers from your CCNA studies as well, and you should also remember that these timers should not be changed lightly. What you might not have known is that if you decide to change any and all of these timers, that change must be configured on the root bridge! The root bridge will inform the nonroot switches of the change via BPDUs.
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Thinkpad Hello Time is the interval between BPDUs, two seconds by default.
Occasionally, during your CCNA and CCNP studies, you'll run into a term that just doesn't quite make sense to you. (Okay, more than occasionally!) One such term is "reverse telnet". As a Cisco certification candidate, you know that telnet is simply a protocol that allows you to remotely connect to a networking device such as a router or switch. But what is "reverse telnet", CCNP home lab setup
Microsoft Forward Delay is the length of both the listening and learning STP stages, with a default value of 15 seconds.
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Laptop Computers Maximum Age, referred to by the switch as MaxAge, is the amount of time a switch will retain a BPDU's contents before discarding it. The default is 20 seconds.
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Laptop Computer The value of these timers can be changed with the spanning-tree vlan command shown below. Verify the changes with the show spanning-tree command.
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Desktop Computer SW1(config)#spanning-tree vlan 1 ?
Notebooks forward-time Set the forward delay for the spanning tree
Lenovo hello-time Set the hello interval for the spanning tree
Hard Drive max-age Set the max age interval for the spanning tree
Travelstar priority Set the bridge priority for the spanning tree
Gateway root Configure switch as root
Laptop Parts
SW1(config)#spanning-tree vlan 1 hello-time 5
Software SW1(config)#spanning-tree vlan 1 max-age 30
Hard Drives SW1(config)#spanning-tree vlan 1 forward-time 20
Electronics SW1(config)#^Z
Canon SW1#show spanning-tree vlan 1
Desktop Pc VLAN0001
Desktop Computers Spanning tree enabled protocol ieee
Think Pad Root ID Priority 32769
Repair Address 000f.90e1.c240
Data Recovery This bridge is the root
Cisco Hello Time 5 sec Max Age 30 sec Forward Delay 20 sec
Keyboard Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)
Monitor Address 000f.90e1.c240
Desktop Hello Time 5 sec Max Age 30 sec Forward Delay 20 sec
Infosys Aging Time 300
Refurbished Laptops Interface Role Sts Cost Prio.Nbr Type
Wipro ---------------- ---- --- --------- -------- --------------------------------
Lap Top Fa0/11 Desg FWD 19 128.11 P2p
Refurbished Fa0/12 Desg FWD 19 128.12 P2p
Memory Again, you should always take great care in changing these timers. Those defaults are set for a reason - helping to prevent switching loops!
Intel
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