`BPDU`

Manage BPDU addresses

Manage the MAC addresses that the switch treats as BPDUs (spanning-tree and similar control frames). They are stored in the L2 cache table, the same table l2 cache add writes. Sub-commands must be typed in full. +, - and -d are synonyms for add, del and show.

show is read-only. add and del overwrite an L2 cache slot without checking what is in it, so they can remove an entry the SAI installed.

bpdu add [Index=<n>] [MACaddress=<mac>]

Write MACaddress as a BPDU address into L2 cache slot Index (default 0). With no options it only prints the defaults. Changes switch state.

Unvalidated

drivshell> bpdu add Index=4 MACaddress=01:80:c2:00:00:00

bpdu del [Index=<n>]

Clear slot Index by writing an all-zero MAC into it. Changes switch state.

Unvalidated

drivshell> bpdu del Index=4

bpdu show

Print unit <u> has <n> BPDU entries and then BPDU <slot>: <mac> for each slot in use. <n> is the size of the table, not the number of entries. Every L2 cache entry is listed, including ones that are not BPDUs. Read-only.

On a SONiC switch the table is empty and only the first line is printed: SONiC traps spanning-tree and other control frames with field-processor rules, not with L2 cache entries.

Hardware-validated

drivshell> bpdu show
unit 0 has 512 BPDU entries

Built-in help

Usages:
      bpdu add [Index=<n>] [MACaddress=<mac>]
            - Add BPDU addresses by index
      bpdu del [Index=<n>]
            - Delete BPDU address by index
      bpdu show
            - Show BPDU addresses and index range

BPDU

`BPDU`