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What is the max age timer?
The max age timer controls the maximum length of time that passes before a bridge port saves its configuration BPDU information. This time is 20 sec by default, but you can tune the time to be between 6 and 40 sec. The migrate time is the time after which a non-assigned port becomes designated.
What is the message age?
The message age is incremented on receipt, and the information discarded if it exceeds the maximum. Thus the number of Bridges the information can traverse is limited.”
What is the maximum age for an STP BPDU in seconds?
max age—The max age timer controls the maximum length of time that passes before a bridge port saves its configuration BPDU information. This time is 20 sec by default, but you can tune the time to be between 6 and 40 sec.
How long does it take for spanning tree to converge?
If a port has to go through all four states, convergence takes 50 seconds: 20 seconds in blocking, 15 seconds in listening, and 15 seconds in learning. If a port doesn’t have to go through the blocking state but starts at a listening state, convergence takes only 30 seconds.
What is the maximum length of STP Spanning Tree Protocol?
The max age timer controls the maximum length of time interval that a Spanning Tree Protocol (STP) Switch port saves its configuration Bridge Protocol Data Unit (BPDU) information. Default max age timer is 20 seconds. You can tune the Spanning Tree Protocol (STP) max age timer to any value between 6 and 40 sec.
What is the default bridge priority?
32768
The default priority is 32768, and additional roots are set below this number. STP increments priority by 4096, so the next priority is 4096 below 32768. The lower the number, the higher the priority.
Should I turn off Spanning Tree?
STP should never be disbaled unless you have an extremely good reason to do so. If you’re wanting to reduce the amount of time it takes for an access port to come up, you should configure it as an edge port instead of disabling STP.
Where is stable BPDU stored in STP max age?
The Max Age timer and the stable BPDU information is stored on a per port basis and not on a per bridge basis. Upon expiration of Max Age timer, the port will transition to designated role and will relay the BPDUs that it receives on its root port.
Which is the maximum delay for BPDU transmission?
BPDU transmission delay (bpdu_delay) —This value is the delay between the time that a BPDU is received on a port and the time that the configuration BPDU is effectively transmitted to another port. The IEEE recommends 1 sec as the maximum BPDU transmission delay.
How does a non root switch affect the BPDU?
Every other non-root switch will increase the Message Age field by one in the received BPDU when relaying it via its own ports. Moreover, on each non-root switch, the BPDU itself will age out in (Max Age – Message Age). This makes sure that the more hops this BPDU has traversed from the root, the sooner it will expire.
Is the message age field in STP set to 0?
The Message Age field in STP is similar to a TTL field in IP packet and is supposed to The Message Age is set to 0 at the root bridge. Every other non-root switch will increase the Message Age field by one in the received BPDU when relaying it via its own ports.