11-21-2006 10:59 PM - edited 03-05-2019 12:57 PM
Hi
From the output below
Port 65 (GigabitEthernet2/1) of VLAN0011 is forwarding
Port path cost 4, Port priority 128, Port Identifier 128.65.
Designated root has priority 24587, address 000f.3412.e7c0
Designated bridge has priority 24587, address 000f.3412.e7c0
Designated port id is 128.65, designated path cost 0
Timers: message age 0, forward delay 0, hold 0
Number of transitions to forwarding state: 1
Link type is point-to-point by default
BPDU: sent 474668, received 3
i want to know what does port 65 stands for.
Thanks
Mahmood
11-21-2006 11:14 PM
Hi Mahmood,
I think its basically the priority number assigned by spanning tree.
When you do a sh spanning tree interface g 2/1, it will show you as a Prio.Nbr
MS_L3_M5#sh spanning-tree interface G2/1
Vlan Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
VLAN0011 Desg FWD 4 128.65 Shr
could not find any documentation though on cisco
HTH, rate if it does
Narayan
11-21-2006 11:19 PM
I think gi 2/1 is root port (port through which the root bridge can be reached) and 65 is root path cost
M.
Hope that helps rate if it does
11-22-2006 12:00 AM
Its not the path cost.
The output shows
Port path cost 4, Port priority 128, Port Identifier 128.65.
Designated port id is 128.65
So the port priority is 128 and 65 is appended to it to make it ID.
Not sure how 65 is calculated maybe from ifindex
HTH, rate if it does
Narayan
11-22-2006 12:09 AM
Hi guys,
i agree with u.I too was not able to find any docs related to it.
Thanks
Mahmood
11-22-2006 12:20 AM
Hi,
Its not the Path Cost but the Gig 2/1 is the 65th Port of the switch.
If you check the same for Gig 2/2 it will show as Port 66.
Hope this will clear your doute.
Regards
Danny
11-22-2006 03:16 AM
Hi
No danny i dnot think so becoz u can see that its gig2/1.any updates...
Ankur where r u dear.
Thanks
Mahmood
11-22-2006 03:53 AM
Hi Mahmood,
Can you please give the same command for Gig 2/2 and give the output
Regards
Danny
11-22-2006 08:12 PM
Hi Mahmood,
Danny is right. The port g 2/2 will indeed show you 66 but it is not the 66th port of the switch but a number that is appended to the Priority of a port.
Still unable to find any docs related to it
Narayan
11-22-2006 09:13 PM
Hi Mohamood,
65 is Port and Gig 2/1 is a Interface.
Lets take 3550 Switch for example, it has Total 26 Ports of which It will can be said as 24 Eht Interface and 2 Gig Interface.
Hope your Doute is clear Rate me if so.
Regards
Danny
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