From: Craig King (cking007@xxxxxxxxxxx)
Date: Mon Nov 05 2001 - 15:08:38 GMT-3
RIP v1 uses UDP broadcasts (255.255.255.255) over port 520 to advertise
route information. The frame map needs to be explicitly configured to
replicate the broadcasts over individual dlci's so that the RIP processes
can communicate with each other.
>From: Brad Caplan <bradcaplan@yahoo.com>
>Reply-To: Brad Caplan <bradcaplan@yahoo.com>
>To: erickbe@yahoo.com, Craig King <cking007@hotmail.com>,
>ccielab@groupstudy.com
>Subject: RE: Basic Frame Relay, RIP, and Split Horizon Question
>Date: Mon, 5 Nov 2001 09:45:01 -0800 (PST)
>
>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
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > >
This archive was generated by hypermail 2.1.4 : Fri Jun 21 2002 - 06:45:04 GMT-3