From: David Luu (wicked01@xxxxxxxxxxxxx)
Date: Sat Jun 01 2002 - 17:40:00 GMT-3
i would like to clear this whole split-horizon thing...
this is the scenario that Yagnesh has...
____R2
/
R1----<
\____R3
R1 being a multipoint interface acting as a hub for R2 and R3...
on R2, Yagnesh sees R3 as root bridge...the way STP works, a blocked port
will not send data and BPDUs...but he can see R3 as root bridge on R2, the
only way for R2 to know is through BPDUs
the reason for him being able to see BPDUs is because of the mapping the
bridge to dlci's...if you ask yourself what does the map bridge statements
have to do with it, think about how frame relay in a multipoint environment
when you have to map ip's to dlci's, it works the same way...you could have
split-horizon turned on and it will still work
in this scenario you need to manipulate R1 as the root bridge for it to
work properly
At 09:42 AM 6/1/2002 -0400, ying chang wrote:
>Sorry, but I would agree with Serguei. We may not be able to call it
>split-horizon, but that's basically why we cannot bridge between 2 spokes
>in multipoint FR environment. Bridge will not send data back out to the
>same port it receives from. I would try point-to-point if I must bridge spokes
.
>
>Chang
>
>>From: David Luu <wicked01@ix.netcom.com>
>>Reply-To: David Luu <wicked01@ix.netcom.com>
>>To: "Bezverkhi, Serguei" <Serguei.Bezverkhi@hp.com>, "Yagnesh
>>Patel" <Yagnesh.Patel@verizon.net>
>>CC: <ccielab@groupstudy.com>
>>Subject: RE: FrameRelay multipoint interface and bridging
>>Date: Fri, 31 May 2002 21:49:38 -0700
>>
>>split horizon deals with routing updates being received and not sent out
>>the same interface...split horizon deals with layer 3, bridging is layer
>>1...it has no relevance in this scenario
>>
>>yagnesh...
>>
>>first of all, does your frame relay work? without any routing protocols
>>running...ping throughout the frame relay cloud, if you cant ping, then the
>>problem lies in your frame relay configs
>>
>>frame relay map bridge statements needs to be in all routers participating
>>in a bridged multipoint frame relay environment...R1s multipoint serial
>>interface, R2 and R3s serial interface (R1 will have 2 map bridge statements)
>>
>>and the bridge group command on all interfaces participating...R1s
>>multipoint serial interface, R2s serial and ethernet, R3s serial and ethernet
>>
>>
>>At 12:03 AM 6/1/2002 -0400, Bezverkhi, Serguei wrote:
>>>It won't work because of the split horizon, and as far as I remember
>>>there is no way to disable it. You have to use point-to-point interfaces
>>>to resolve this.
>>>
>>>Hope it helps
>>>
>>>Serguei
>>>
>>>-----Original Message-----
>>>From: Yagnesh Patel [mailto:Yagnesh.Patel@verizon.net]
>>>Sent: May 31, 2002 10:41 PM
>>>To: ccielab@groupstudy.com
>>>Subject: FrameRelay multipoint interface and bridging
>>>
>>>
>>>Hi,
>>> Can anyone please provide me a good solution for the following problem.
>>>
>>>R1= Hub router with a multipoint interface
>>>R2 = Spoke_1 with Connected to R1's multipoint interface thru
>>>Frame-relay R3 = Spoke_2 Connected to R1's multipoint interface thru
>>>Frame-relay VLAN_2 = Connected to R2 router VLAN_3 = Connected to R3
>>>router
>>>
>>> I want to bridge VLAN2 and VLAN3. I have all appropriate commands under
>>>
>>>the interfaces / global including "frame-relay map bridge" statement but
>>>
>>>it is not working. I think it is not working because both spokes are
>>>connected to the same multipoint interface on R1.
>>>
>>>
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