From: TCP IP4 (tcp.ip4@gmail.com)
Date: Sun Dec 07 2008 - 23:02:50 ARST
Technically you're correct. But how do you modify the time from blocking
to learning without forward-delay? The original question is to have host
wait for 16s to become forward and by setting forward-delay timer to 8 seems
to satisfy the question.
On Sun, Dec 7, 2008 at 4:55 PM, Ali El Moussaoui <mousawi.ali@gmail.com>wrote:
> I still do not agree...blocking to learning is not a forwarding delay else
> you will have to consider the same for PVST then either solutoin will be
> correct but not both.
>
> On Sun, Dec 7, 2008 at 4:15 PM, TCP IP4 <tcp.ip4@gmail.com> wrote:
>
>> No, 2 state changes are needed for MST. Jason is right.
>>
>> blocking -> learning: one forward-delay
>> learning -> forwarding: two forward-delays
>>
>> Following is from a test switch with MST0 forward-delay set to 8 when port
>> is unshut:
>>
>> *Mar 2 06:16:42.483: MST[0]: Gi1/0/5 state change disabled -> blocking
>> *Mar 2 06:16:42.626: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/5,
>> changed state to up
>> *Mar 2 06:16:43.632: %LINEPROTO-5-UPDOWN: Line protocol on Interface
>> GigabitEthernet1/0/5, changed state to up
>> *Mar 2 06:16:50.486: MST[0]: Gi1/0/5 state change blocking -> learning
>> *Mar 2 06:16:58.489: MST[0]: Gi1/0/5 state change learning -> forwarding
>>
>>
>> On Sun, Dec 7, 2008 at 3:16 PM, Ali El Moussaoui <mousawi.ali@gmail.com>wrote:
>>
>>> MST has one forwarding delay so it should be "span mst forward 16"....
>>> any
>>> comments?
>>>
>>>
>>>
>>> On Sun, Dec 7, 2008 at 1:27 PM, Jason Madsen <madsen.jason@gmail.com>
>>> wrote:
>>>
>>> > With that wording I would assume we don't have to manipulate max-age
>>> etc.
>>> > and we should just be able to change the forward-time to 8 seconds.
>>> >
>>> > mst - spann mst forward 8
>>> > pvst - spann vlan x forward 8
>>> >
>>> > Jason
>>> >
>>> > On Sun, Dec 7, 2008 at 2:21 PM, Paul Adams <ccie.paul@gmail.com>
>>> wrote:
>>> >
>>> > > Hi GS,
>>> > >
>>> > > Got a scenario, hope to get some input on it.
>>> > >
>>> > >
>>> > > Sw3 is connected to Sw4, when the ports failed the other port will
>>> wait
>>> > for
>>> > > 16 sec before the interface begins forwarding
>>> > >
>>> > > ( ports fa 0/3-4) SW3==================SW4 ( ports fa 0/3-4)
>>> > >
>>> > >
>>> > > What configuration are required on SW3 in scenario of mode MST and
>>> > scenario
>>> > > of Mode PvST
>>> > >
>>> > >
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>>> > >
>>> > >
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