Re: covergence in RSTP

Ah... that will have an interesting interoperation with Cisco's STP :-)

--
Marko Milivojevic - CCIE #18427 (SP R&S)
Senior CCIE Instructor - IPexpert
On Tue, Jun 26, 2012 at 10:29 AM, Nicky <ccienovice_at_gmail.com> wrote:
> Hi Shekhar,
>
> As Brian has mentioned, in non-cisco environment the command is "edge".
>
> The command would be:-
>
> *set protocols rstp interface ge-0/0/1 edge*
>
> HTH.
>
> Cheers,
> Nicky
>
> On Mon, Jun 25, 2012 at 8:52 PM, shekhar sharma
> <shekhar.sharma21_at_gmail.com>wrote:
>
>> Hi brian,
>>
>> Agreed on that part......
>>
>> But my doubt is how things will work in non-cisco environment e.g juniper
>> ,HP etc...
>>
>> Is this vendors have alternate command....or edge ports will still suffer.
>> from time dealy...........................................
>> I m sorry but nt have any expereince with non-cisco swithes....just want to
>> understand the protocol from deep....as how RSTP behaves for access
>> ports.... in general...
>>
>>
>> regards,
>> Shekhar
>> On Mon, Jun 25, 2012 at 6:54 PM, Brian McGahan <bmcgahan_at_ine.com> wrote:
>>
>> > Hi Shekhar,
>> >
>> > It's technically not portfast, its configuring the link as an edge port.
>> > B In Catalyst IOS when you're running RSTP the links don't run as edge
>> ports
>> > automatically. B Instead of adding a "spanning-tree edge" or similar
>> > command, they simply made the "spanning-tree portfast" command do the
>> same
>> > thing. B The idea is that if you're migrating from legacy PVST to Rapid
>> PVST
>> > or to MST, your ports that used to be portfast ports now become edge
>> ports.
>> > B They basically do the same thing, but in RSTP they're called edge ports
>> > instead of portfast ports.
>> >
>> >
>> > HTH,
>> >
>> > Brian McGahan, CCIE #8593 (R&S/SP/Security)
>> > bmcgahan_at_INE.com
>> >
>> > Internetwork Expert, Inc.
>> > http://www.INE.com
>> >
>> > -----Original Message-----
>> > From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
>> > Bruno Silva
>> > Sent: Monday, June 25, 2012 9:36 AM
>> > To: shekhar sharma
>> > Cc: Cisco certification
>> > Subject: Re: covergence in RSTP
>> >
>> > you will still have to use portfast even with RSTP due to standard
>> > specifications.
>> >
>> > On Mon, Jun 25, 2012 at 9:49 AM, shekhar sharma
>> > <shekhar.sharma21_at_gmail.com>wrote:
>> >
>> > > Hi Experts ,
>> > >
>> > > I know RSTP is mush faster than legacy STP or PVST because of its
>> > > alternate ,,,back ports & a different algorithm to achive faster
>> > > convergence in the interswitch links & uplinks.
>> > >
>> > > But I am little confused about its behaviour for edge ports i.e access
>> > > ports.
>> > >
>> > > Yesterday I have done some tests ,,,.Observation is without enablings
>> > > portfast on acess ports ,if I am doing shut/noshut on that accessport
>> > > interface. convergence is slow and I am getting 10 packet drops b/w
>> > > the pings.
>> > >
>> > > But with portfast enabled , convergence is faster and my gettig 2-3
>> > > packet drop.
>> > >
>> > > So, the question is if portfast is still required in RSTP ,then how
>> > > will we utilize its use in non-cisco environment .since portfast is
>> > > cisco propriteiry.....
>> > >
>> > > Thanks,
>> > > Shekhar
>> > >
>> > >
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