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Author Topic: Nortel ERS 55xx showing root port as 0  (Read 2192 times)

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Offline lcndkc

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Nortel ERS 55xx showing root port as 0
« on: June 24, 2013, 06:53:27 PM »
I am wondering why the Nortel ERS 5520 is currently displaying its STP Root port as 0.  So far to my knowledge this particular switch is the only one that is displaying 0 as its root port.  We are currently running 6.2.1 software and 6.0.0.10 as the firmware.  Can anyone explain to me why it's using/displaying the DR port number as 0?


Thanks!


Offline Johan Witters

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    • BKM Networks
Re: Nortel ERS 55xx showing root port as 0
« Reply #1 on: June 25, 2013, 02:39:21 AM »
Probably because it is the root switch in the network? If the switch is the root, it has no other machine that it can refer to as "root", so the root port is 0.

You could check the ID to confirm, or check the configured stp priority for that switch..
Kind regards,

Johan Witters

Network Engineer
BKM NV

Offline Flintstone

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Re: Nortel ERS 55xx showing root port as 0
« Reply #2 on: June 25, 2013, 04:20:31 AM »
Hi Icndkc and welcome to the forum,

I believe if your Nortel ERS 5520 is the Root switch, then Root path cost for all its ports would be 0.  Other connected switches ports Root path cost would therefore be cumulative and be higher than 0 based on the link cost to the Root switch.

CheerZ