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REF: BRIDGE CRITERIA AND MANUAL ENTRY OF PORT PRIORITY MULTIPLES OF 16

Posted on 2011-02-27
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Last Modified: 2012-05-11
RERERING TO ELECTION CRITERIA BUT SPECIFIC TO 'LOWEST SENDER PORT ID'

If there is a design of switches in the form of a tree or whatever, for example and the 'Root Bridge/Switch' is at the TOP and a company wished to add a 'Manual entry' ie to prioritize each of their department switches.

I have read it can be done as although the default priority is 128, this can be changed specifically for individual vlans in multiples of 16 ie:

Lowest Sender Port ID
- consists of Port priority
- And port ID (port number)
- Port priority can be configured
- config-if)#spanning-tree vlan 10 port-priority 16, or 32 or 48 etc etc

If this is true does that mean if a company does NOT have the relevant IOS features to use 'SAY'  'RSTP+ OR MST', which have the feature, 1 instance per vlan, is the above an 'OLD' feature which was replace by 'RSTP+ OR MST' for example?
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Question by:mikey250
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Don Johnston earned 500 total points
ID: 34993924
>I have read it can be done as although the default priority is 128

A default priority of 128 is in the DEC spanning-tree spec. The default priority in IEEE 802.1d spanning-tree is 32768.

>this can be changed specifically for individual vlans in multiples of 16 ie:

You can only change the priority on a per-VLAN basis if you're running Per-VLAN spanning-tree.

The original STP (DEC) and the industry implementation of 802.1d uses Common (or Mono) Spanning-Tree. That is a single instance of spanning-tree regardless of VLANs. Cisco's implementation is to have a separate instance for each VLAN.
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