From: Hobbs (deadheadblues@gmail.com)
Date: Wed Dec 10 2008 - 16:35:53 ARST
Nevermind, I understand this now. The opposite end has to be RSTP capable. I
forgot to enable RSTP on the remote switch now I get this:
02:13:17: RSTP(1): initializing port Fa0/13
02:13:17: RSTP(1): Fa0/13 is now designated
02:13:17: RSTP(1): transmitting a proposal on Fa0/13
02:13:17: RSTP(1): received an agreement on Fa0/13
02:13:18: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/13,
changed state to up
SW3#show spanning-tree | inc 0/13
Fa0/13 Desg FWD 19 128.13 P2p
SW3#
DocCD doesn't see to mention that but I guess if you understand RSTP then
you realize the whole proposal/agreement thing.
On Wed, Dec 10, 2008 at 11:31 AM, Hobbs <deadheadblues@gmail.com> wrote:
> Hello,
>
> SW3 f0/3 ------e0/1 R3
>
> Rapid-PVST+ detects this link as shared since it is half-duplex.
> This causes RSTP to wait 2 x forward-delay before forwarding (when this
> port is enabled).
> In order to have it forward immediately once it becomes DESIGNATED I change
> the link type to P2P.
>
> However this didn't seem to work ( I am using a forward delay of 5 seconds
> to speed it up):
>
> SW3#show run | inc pvst
> spanning-tree mode rapid-pvst
>
> SW3#debug spanning-tree events
> Spanning Tree event debugging is on
>
> SW3#conf t
> SW3(config)#int f0/3
> SW3(config-if)#shut
> SW3(config-if)#spanning-tree link-type point-to-point
> SW3(config-if)#no shut
> SW3(config-if)#^Z
>
> 02:00:00: RSTP(1): initializing port Fa0/3
> 02:00:00: RSTP(1): Fa0/3 is now designated <---- NOW IT SHOULD
> FORWARD
> 02:00:00: RSTP(1): transmitting a proposal on Fa0/3
>
> SW3#show spanning-tree | inc 0/3
> Fa0/3 Desg BLK 100 128.3 P2p <---- STILL
> BLOCKING (BUT ITS "DESG" ROLE)
>
> 02:00:02: RSTP(1): transmitting a proposal on Fa0/3
> 02:00:04: RSTP(1): transmitting a proposal on Fa0/3
> 02:00:05: RSTP(1): Fa0/3 fdwhile Expired
> 02:00:06: RSTP(1): transmitting a proposal on Fa0/3
> 02:00:08: RSTP(1): transmitting a proposal on Fa0/3
> 02:00:10: RSTP(1): transmitting a proposal on Fa0/3
> 02:00:10: RSTP(1): Fa0/3 fdwhile Expired
>
> SW3#show spanning-tree | inc 0/3
> Fa0/3 Desg FWD 100 128.3 P2p <---- NOW IT'S
> FORWARDING
> SW3#
>
> This is from the DocCD:
>
> spanning-tree link-type point-to-point
> (Recommended for rapid-PVST+ mode only) Specify that the link type for this
> port is point-to-point.
> If you connect this port (local port) to a remote port through a
> point-to-point link and the local port becomes a designated port, the switch
> negotiates with the remote port and rapidly changes the local port to the
> forwarding state.
>
> Am I testing this wrong? AM I misunderstanding what the DocCD says?
> I have also tried this with a switch to switch connection on another port,
> and it still waits 2 x FD.
>
> thanks,
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