From: Vincent Celindro (vcelindro@xxxxxxxxxxxxxxxx)
Date: Mon Nov 05 2001 - 15:26:19 GMT-3
Well let me take a stab at this. Frame-relay is NBMA. That is why you could
get it to work with point-to-point connections. Did you disable
inverse-arp?, if not then the subinterfaces should have worked. Another
thing when doing the same setup, but l3 is OSPF you'll need on the
interface, ip ospf network (point-to point or point to multipoint).
Vince
At 09:45 AM 11/5/2001 -0800, Brad Caplan wrote:
>THAT'S IT!!!! Woo Hoo! I added 'broadcast' to the end
>of the map statements, and that did the trick! The LAN
>routes are now showing up in all routing tables.
>
>The frame map statements are mapping DLCI's to the
>Serial interfaces of the other routers, so I'm not
>sure how this parameter makes the LAN networks be
>advertised as well. Anyone care to explain?
>
>Thanks for all the help!!!!
>
>--- "Erick B." <erickbe@yahoo.com> wrote:
> > 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
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > >
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