From: Craig King (cking007@xxxxxxxxxxx)
Date: Mon Nov 05 2001 - 11:38:53 GMT-3
I may be repeating what Parry is saying, but I'll say it anyway:
On the spoke routers, are you using inverse-arp or frame maps? Assuming you
are using frame maps, have you included an entry for each spoke router
mapping the remote spoke to the hub's dlci? Without this, the router won't
know what dlci to send the traffic along to.
Also, enable frame-relay debugging (debug frame packet or debug frame
verbose) and check to see what errors you see on the originating spoke side.
Encapsulation failed messages indicate no ip-to-dlci mapping exists for
the router to forward the frame over. Enable this on both spokes and the
hub. For the ping to work properly, you will need the return path to be set
up properly as well.
Since the serial interfaces are all part of the same logical network, remove
L3 (RIP and split-horizon) from the equation and just troubleshoot L2 and
get that working - every serial interface should be abe to ping each other.
When that's working, then you can introduce L3 and deal with split-horizon
issues.
HTH,
CK
>From: "Chua, Parry" <Parry.Chua@compaq.com>
>Reply-To: "Chua, Parry" <Parry.Chua@compaq.com>
>To: "'Brad Caplan'" <bradcaplan@yahoo.com>, ccielab@groupstudy.com
>Subject: RE: Basic Frame Relay, RIP, and Split Horizon Question
>Date: Mon, 5 Nov 2001 15:15:20 +0800
>
>Hi,
>
>When you create a p2p sub interface, it behave like a orginal physical
>serial interface, ie
>sp is enabled. Looking at your topology, it is NOT a fully mesk FR, you
>must
>ensure that
>spoke can reach the other spoke. In typical case, you make use of
>spoke->hub->spoke for layer 2 reachability. Each router must has a path to
>other router.
>
>Next is the routing update(layer 3). From your topology, sp must be enable
>on hub and usually should be disable on spoke. Reason is hub has to act
>upon
>for the spoke to pass the routing update, for example, update send from R2
>should receive by R1, R3 to R6, the path from R2 routing update send to
>R1(hub), later R1(hub) should forward this update to R3...R6. R1 using one
>(common) interface to reach R2 to R6, if sp is enable, it will not forward
>the update learn from R2 to R6 out from the same interface.( of course if
>you create multiple sub interface at R1 will resolve this problem but it
>also mean you has to create seperate subnet).
>
>What will happen is route update send from R2 to R6 will be send back to
>then again with additional hop count. You can control by filtering if
>necessary. If sp is diable on R2 to R6
>( default FR on main intercface), then you should enable SP on spoke router
>to prevent it from sending unnecessary update back to R1.
>
> > Parry Chua
> > COMPAQ Computer Asia Pte Ltd
> > Customer Services - APD
> > Tel : +65-395-1856
> > Fax : +65-3951878
> > Email : parry.chua@compaq.com
> >
> >
>
>
>-----Original Message-----
>From: Brad Caplan [mailto:bradcaplan@yahoo.com]
>Sent: Monday, November 05, 2001 2:45 PM
>To: Chua, Parry; ccielab@groupstudy.com
>Subject: RE: Basic Frame Relay, RIP, and Split Horizon Question
>
>
>There is connectivity to all serial interfaces. R1 can
>ping all spokes and vice versa. Unfortunately, I can't
>seem to get RIP to advertise the ethernet interface
>network addresses. All spokes can ping the ethernet
>interface of R1, but not the ehternet interfaces of
>the other spokes.
>
>It seems like the problem is a split horizon issue
>whereby R1 is not forwarding the spoke ethernet
>network addresses. I can get it to work if I use sub
>interfaces (point-to-point) but am wondering if there
>is any other way.
>
>Brad
>
>
>
>--- "Chua, Parry" <Parry.Chua@compaq.com> wrote:
> > Hi,
> >
> > You need to verify the datalink(layer2) reachability
> > first using network
> > layer address to verify. From your topology, it is
> > assume that R1 is the
> > hub, R2 to R6 are spokes. It is assume that R1 has 5
> > dlci to reach R2 to R6.
> > It is assume that R2 to R6 each has one dlci and can
> > only reach R1. The
> > first step you need to do is to ensure that R1(hub)
> > can ping (spokes)R2 to
> > R6 and vice versa. Next you need to verify R2 to R6
> > (spoke to spoke). Afther
> > this is done.
> > Next it what routing protocols to run in this cloud,
> > each has problem to
> > resolve.
> >
> >
> >
> > > Parry Chua
> > >
> >
> >
> > -----Original Message-----
> > From: Brad Caplan [mailto:bradcaplan@yahoo.com]
> > Sent: Monday, November 05, 2001 9:57 AM
> > To: ccielab@groupstudy.com
> > Subject: Basic Frame Relay, RIP, and Split Horizon
> > Question
> >
> >
> > I have a Hub and Spoke configuration setup as
> > follows:
> >
> > R1------FR-------R2
> > |
> > --------R3
> > |
> > --------R5
> > |
> > --------R6
> >
> > All of the router's serial connections are in the
> > 10.1.1.x/24 network. Each router's ethernet
> > connection
> > is in a different class A network. Each router is
> > running RIP.
> >
> > I can only ping the LAN interfaces of all
> > routers if I use point-to-point subinterfaces on the
> > spoke routers.
> >
> > Is it possible to achieve this same connectivity
> > without using sub-interfaces? I tried using the 'no
> > ip
> > split-horizon' command on the serial interface of
> > the
> > hub router, (R1) but that does not seem to help.
> >
> > Thanks,
> > Brad
> >
> >
> >
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