Masaru,
The main importance of the physical "main" interface configuration in
frame-relay is to set your encapsulation and or/LMI-Type if you use ANSI or
Q.933a, the default of CISCO is already set for you, and you do not need to
manually configure it either unless you have disabled inverse-arp. The
scenario I gave you resolves your issue with HSRP and the UP UP situation
for standby tracking. You want to generate a UP Down situation so you have a
true failover, which your current configuration cannot provide.. at least I
am not aware of another way. The advantage to sub-interfaces which include
scalability, dlci prioritization, and your little HSRP problem are just a
few the the added values of doing it.. You will always need the Physical
Interface configuration for Layer 2 capabilities, but the layer 3 can be
done on a sub-interface level where you will also specify your local dlci
information. In your setup you would want to use point-to-point links since
your not in a Hub-and-Spoke or Full-Mesh design, where you need multipoint
connections.If you use a subinterface.. and your link to R1 goes down, you
will generate an UP DOWN on R3's subinterface where if you track that
subinterface in HSRP, it will fail over to R4. Here is a URL that may help
anything I missed.. the Cisco DOC CD is a valuable source of information on
this kind of stuff.. You may also want to thoroughly read through Chapter 4
of Caslow/Pavlichenko's:Bridges, routers, and Switches for CCIE's. They
explain the different uses of Frame-relay pretty well.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/wan_c/wcdfrely.htm#31757
All the Best!
Sal
Masaru Umetsu wrote:
>
> Thanks Salvatore.
>
> As a resolution, is it only to change the configuration from
> main-interface to sub-interface p2p？
> If it is only sub-interface p2p, when and how should I use
> main-interface frame-relay configuration ? Don't you usually
> use main-interface
> frame-relay configuration ?
> Is there any solution by using current(main-interface)
> configuration to
> resolve my problem ?
> If there's something good to see, please let me know the URL or
> book.
>
> Thanks.
>
> On Sat, 12 Jul 2003 02:58:51 GMT
> "Salvatore De Luca" wrote:
>
> nobody> When you have a FR connection, you have a dedicated
> circuit to your provider
> nobody> which then on taps into the frame cloud. So consider it
> alomost like a
> nobody> point-to-point link to your local Carrier and then from
> there you connect
> nobody> within the providers Frame Switch into their Frame
> Relay cloud. Now, when
> nobody> you shutdown R1's Wan interface your HSRP failed over
> fine. The reason that
> nobody> R3 was showing Up Up was that your circuit to your
> carrier from R3 did not
> nobody> go down and it stil exhanges LMI with R3's Physical
> interface, your PVC
> nobody> should have been showing INACTIVE at this point though.
> I would recommend
> nobody> using point-to-point subinterfaces on your FR WAN
> connections. When you do
> nobody> this and then shut down one end of the link the line
> protocol on the
> nobody> sub-interface of R3 would go "UP DOWN" and if you then
> track the
> nobody> SUB-Interface, you should have a successful failover
> for the "Standby Track"
> nobody> command on R3. Currently, you have outboud traffic
> going out R2 --->R4 and
> nobody> return traffic going to the Active HSRP router "R3"
> then dropping packets
> nobody> because your PVC is INACTIVE and you are in an UP UP
> state..
> nobody>
> nobody> You have successfully achieved Asymetrical routing.. :(
> nobody>
> nobody> Until your Interface Line protocol Drops in an "UP
> DOWN" state on R3's WAN
> nobody> interface.. then Standby Interface tracking wont do
> anything..
> nobody>
> nobody>
> nobody> Masaru Umetsu wrote:
> nobody> >
> nobody> > Dear all
> nobody> >
> nobody> > I have a question about frame-relay. Network Diagram
> is below.
> nobody> >
> nobody> > R1----* * *----R3
> nobody> > | * FR * |
> nobody> > R2----* * *----R4
> nobody> >
> nobody> > I configured a HSRP between R1 and R2, R3 and R4.
> nobody> > R1,R3 are Active router.(R2,R4 are Standby router)
> nobody> > And I configured standby track in a Wan side of R1,R3.
> nobody> >
> nobody> > When I disabled(shutdown the interface) the serial0/0
> of R1 ,
> nobody> > then R2 became Active router. It's ok.
> nobody> > But R3 didn't detect a down of Wan side,so serial0/0
> of R3 is
> nobody> > up-up.
> nobody> > Therefore,I can't send a data between R2 and R4.
> nobody> > Regarding Frame-relay configuration, I configured
> frame-relay in
> nobody> > main-interface. Is it a mechanism of Frame-relay in
> nobody> > main-interface ?
> nobody> > I don't know in detail. Should I use sub-interface &
> nobody> > point-2-point
> nobody> > definition in frame-relay to use HSRP standby track ?
> Please
> nobody> > explain me
> nobody> > about this problem.
> nobody> >
> nobody> >
> nobody>
> nobody>
> nobody>
> nobody>
>
>
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