From: Brian McGahan (bmcgahan@internetworkexpert.com)
Date: Sat Aug 04 2007 - 09:50:02 ART
> I still need further clarification about your statement "...you are
just
> sending double broadcast traffic towards hub router". Say R4 has more
> than one frame map statements with the "broadcast" keyword and it runs
> EIGRP over the FR interface. Is it gonna send two copies of whatever
> EIGRP packets (destined to 224.0.0.10) towards R2?
Yes, if you have a config similar to the following:
> int s 0/0
> frame-relay map ip 10.10.10.2 402 broadcast
> frame-relay map ip 10.10.10.5 402 broadcast
Although only one layer 3 multicast will be sent to the
interface in the case of EIGRP, the Frame Relay process will replicate
the packet twice at layer 2. This is known as pseudo-broadcast or
replicated-unicast. Try this out, "debug ip icmp" on the other side of
the link, then "ping 255.255.255.255 repeat 1" from the side with the
multiple broadcast mappings and see what your results are.
HTH,
Brian McGahan, CCIE #8593 (R&S/SP/Security)
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
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> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> brajesh.thakur@wipro.com
> Sent: Saturday, August 04, 2007 6:29 AM
> To: tohsoon28@gmail.com
> Cc: ccielab@groupstudy.com
> Subject: RE: "frame-relay map broadcast" command for spoke-to-spoke
>
> I believe the last two statements mean same thing, Anyone correct me
if
> my understanding is wrong.
>
>
>
> Warm Regards,
>
> Brajesh Thakur
>
> ________________________________
>
> From: Toh Soon, Lim [mailto:tohsoon28@gmail.com]
> Sent: Saturday, August 04, 2007 4:30 PM
> To: Brajesh Thakur (WI01 - Services)
> Cc: ccielab@groupstudy.com
> Subject: Re: "frame-relay map broadcast" command for spoke-to-spoke
>
>
>
> Hi Brajesh,
>
> I think I got what you mean. The following two configs of R4 should be
> functionally equivalent, i.e. to enable broadcast on DLCI 402 without
> sending redundant broadcast traffic :
>
> !
> int s 0/0
> frame-relay map ip 10.10.10.2 402 broadcast
> frame-relay map ip 10.10.10.5 402
> !
>
> Or
>
> !
> int s 0/0
> frame-relay map ip 10.10.10.2 402
> frame-relay map ip 10.10.10.5 402 broadcast
> !
>
> I still need further clarification about your statement "...you are
just
> sending double broadcast traffic towards hub router". Say R4 has more
> than one frame map statements with the "broadcast" keyword and it runs
> EIGRP over the FR interface. Is it gonna send two copies of whatever
> EIGRP packets (destined to 224.0.0.10) towards R2?
>
> To quote you " In lab they may have mentioned something like "don't
> duplicate broadcast traffic when sending data from spoke" ", do the
> following two statements mean the same thing?
>
> (1) Do not send any redundant broadcast traffic from the spokes to the
> hub.
>
> (2) Ensure that Spoke1 and Spoke2 can ping each other's FR interface,
> but this config should be performed such that Hub does not receive
> redundant routing updates.
>
>
> Thank you.
>
> B.Rgds,
> Lim TS
>
>
>
> On 8/4/07, brajesh.thakur@wipro.com <brajesh.thakur@wipro.com> wrote:
>
>
> Dear Lim,
>
> If you are using 'broadcast' keyword for both map commands on
> spoke
> router, you are just sending double broadcast traffic towards
> hub router
> as broadcast is enabled per dlci basis and not per ip address
> basis. In
> lab they may have mentioned something like "don't duplicate
> broadcast
> traffic when sending data from spoke"
>
> Warm Regards,
> Brajesh Thakur
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> Behalf Of
> Toh Soon, Lim
> Sent: Saturday, August 04, 2007 2:34 PM
> To: ccielab@groupstudy.com
> Subject: "frame-relay map broadcast" command for spoke-to-spoke
>
> Hi All,
>
> I have a hub-and-spoke frame relay network, the DLCIs are as
> follows:
>
> R2 (204)------------(402) R4
> (205)------------(502) R5
>
> R2 is the hub whereas R4 & R5 are the spokes.
>
> R2 Config
> ---------
> !
> int s 0/0
> ip add 10.10.10.2 255.255.255.0
> encap frame-relay
> no frame-relay inverse-arp
> frame-relay map ip 10.10.10.4 204 broadcast
> frame-relay map ip 10.10.10.5 205 broadcast
> !
>
> R4 Config
> ---------
> !
> int s 0/0
> ip add 10.10.10.4 255.255.255.0
> encap frame-relay
> no frame-relay inverse-arp
> frame-relay map ip 10.10.10.2 402 broadcast
> frame-relay map ip 10.10.10.5 402 broadcast
> !
>
> R5 Config
> ---------
> !
> int s 0/0
> ip add 10.10.10.5 255.255.255.0
> encap frame-relay
> no frame-relay inverse-arp
> frame-relay map ip 10.10.10.2 502 broadcast
> frame-relay map ip 10.10.10.4 502 broadcast
> !
>
> For the spoke routers, what's the difference if the frame map
> statement
> pointing to each other has the "broadcast" keyword compared to
> without
> the
> "broadcast" keyword? Either way, the spoke routers can ping to
> each
> other.
> I believe it has no bearing on routing protocol neighbor
> adjacencies.
> Adjacency is only established with the hub router as far as OSPF
> and
> EIGRP
> are concerned.
>
> My understanding is, the frame map statements are not even
> required
> between
> spokes when we run EIGRP or OSPF (p2mp) on the frame relay
> network.
>
> Please enlighten me.
>
>
> Thank you.
>
> B.Rgds,
> Lim TS
>
>
>
This archive was generated by hypermail 2.1.4 : Sat Sep 01 2007 - 11:32:09 ART