From: Erick B. (erickbe@xxxxxxxxx)
Date: Mon Nov 05 2001 - 14:14:37 GMT-3
If using frame map statements, are you including the
broadcast keyword?
Can you post configs?
--- Brad Caplan <bradcaplan@yahoo.com> wrote:
> As mentioned below, I have layer 2 connectivity - I
> can ping all the serial interfaces from any router.
> I
> am having problems with L3 (RIP and split horizon.)
>
> I am using map statements on the spoke routers. I
> can
> only see all networks in the route table of the hub
> if
> I use subinterfaces (Point-to-Point) on the spoke
> routers. Is there a way to do this without using sub
> interfaces and point-to-point connections?
>
> I thought I could just use 'no ip split-horizon' on
> the hub, but that does not seem to work.
>
>
> --- Craig King <cking007@hotmail.com> wrote:
> > 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
> > > >
> > > >
> > > >
> > > >
This archive was generated by hypermail 2.1.4 : Fri Jun 21 2002 - 06:45:04 GMT-3