From: Brian Dennis (brian@5g.net)
Date: Thu Sep 12 2002 - 06:01:20 GMT-3
The routers we were working with had ip routing disabled. Also the
problem was how would a bridge by default forward packets out the same
physical interface that it was received on.
Brian Dennis, CCIE #2210 (R&S/ISP Dial)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Omer Ansari
Sent: Wednesday, September 11, 2002 4:34 PM
To: Brian Dennis
Cc: 'Volkov, Dmitry (Toronto - BCE)'; 'Guoqi Cui';
ccielab@groupstudy.com
Subject: RE: Bridging over frame-relay with hub and spoke topology
hello,
I tried labbing this out,
there's one extra thing I want to mention, correct me if i'm wrong
somewhere..
noticed that in order to bridge ip across from end hosts (so they
could ping), i needed to enable bridge irb on the hub and spokes also.
[i have ip routing enabled on my hub and spokes]
my understanding is that before bridge irb,
e.g. on r3, it would not bridge ip across s2/0
R3#sh int s2/0 irb
Serial2/0
Bridged protocols on Serial2/0:
appletalk clns decnet vines
apollo ipx xns
.....
but after i enabled it,
R3(config)#bridge irb
R3(config)#^Z
R3#sh int s2/0 irb
Serial2/0
Bridged protocols on Serial2/0:
appletalk clns decnet ip
vines apollo ipx xns
needed to do the above for all FR interfaces.
and then the pings flowed.
2nd point: i'm sure such a simplistic situation can never come in the
lab,
and if routers have to bridge a protocol such as IP across certain
interfaces which might also be receiving IP Routing Protocol updates,
then
instead of putting the ip address on the physical interface, creating a
BVI would be the best bet.
regards,
Omer
On Tue, 10 Sep 2002, Brian Dennis wrote:
> Yes, using sub-interfaces is one solution. If you can't use
> sub-interfaces then having the devices connected to the spokes forward
> the packets to a router that's connected to the hub is a solution
> (static or policy routing). A not so pretty solution is to use a bunch
> of static bridge entries and static ARP entries but it'll work.
>
> If you try the configs that he posted you'll see that they won't work.
>
> Brian Dennis, CCIE #2210 (R&S/ISP Dial)
>
> -----Original Message-----
> From: Volkov, Dmitry (Toronto - BCE) [mailto:dmitry_volkov@ca.ml.com]
> Sent: Tuesday, September 10, 2002 10:06 PM
> To: 'Brian Dennis'; 'Guoqi Cui'
> Cc: ccielab@groupstudy.com
> Subject: RE: Bridging over frame-relay with hub and spoke topology
>
> Here is again a source of confusing: Solie book Lab 26 and Skynet Lab
> solution.
> The solutions provided there use exactly the same config as Guoqi
> posted,
> just bridge-group X added on interfaces. So, because it's not possible
> to
> bridge out the same interface where frames are received - only way to
> use
> subinterfaces on hub router (one for ech spoke) ?
> Brian - what are other solutions ? You said a few ?
>
> Thanks,
> Dmitry
>
> > -----Original Message-----
> > From: Brian Dennis [mailto:brian@5g.net]
> > Sent: Tuesday, September 10, 2002 9:47 PM
> > To: 'Guoqi Cui'; ccielab@groupstudy.com
> > Subject: RE: Bridging over frame-relay with hub and spoke topology
> >
> >
> > Think about how a bridge normally forwards packets. Does a bridge
> > normally forward packets out the same interface that they are
received
> > on? The answer of course is no. This being the case, why would you
> > expect R3 to forward packets out the same interface (Serial0/1) it
was
> > received on?
> >
> > With this in mind you should be able to come up with a few
solutions.
> >
> > Brian Dennis, CCIE #2210 (R&S/ISP Dial)
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> > Behalf Of
> > Guoqi Cui
> > Sent: Tuesday, September 10, 2002 6:14 PM
> > To: ccielab@groupstudy.com
> > Subject: Bridging over frame-relay with hub and spoke topology
> >
> > Hi, group:
> >
> > I am trying to configure bridging over frame-relay
> > with hub and spoke topology. Somehow, the two spokes
> > can ping the hub, but the two spokes can not ping each
> > other. Is this the correct operation or I missed
> > something?
> >
> >
> >
> > Thank you.
> >
> > Guoqi
> >
> > R3 is the hub
> >
> > R1, R4 are spokes in frame-relay. each of the has
> > ethernet connection to three other routers acting as
> > hosts.
> >
> > R3:
> > interface Serial0/1
> > no ip address
> > encapsulation frame-relay
> > frame-relay map bridge 301 broadcast
> > frame-relay map bridge 304 broadcast
> >
> > R1:
> > interface Serial0/1
> > no ip address
> > encapsulation frame-relay
> > frame-relay map bridge 103 broadcast
> >
> > R4:
> > interface Serial0/1
> > no ip address
> > encapsulation frame-relay
> > clock rate 64000
> > frame-relay map bridge 403 broadcast
> >
> >
> >
> >
> >
> >
> >
> > __________________________________________________
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