From: Brian Dennis (brian@labforge.com)
Date: Sun Jun 22 2003 - 01:08:09 GMT-3
Is there a reason you are not using a frame-relay map statement on R2?
Do not rely on inverse-arp in the CCIE lab. ALWAYS use frame-relay map
statements on physical interfaces or multipoint subinterfaces if the lab
permits. Properly configured frame-relay map statements work 100% of the
time whereas inverse-arp does not work 100% of the time.
Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Wei Zou (wzou)
Sent: Saturday, June 21, 2003 8:44 PM
To: Mike Williams
Cc: ccielab@groupstudy.com
Subject: RE: Frame Relay question
Thanks Mike:
Yeah, I do have enca frame-realy configured otherwise I can not
configure
frame relay related command under subinterfaces.
I just reset up a network just with 2 routers and fr switch, then
eververy
thing works fine. I just don't know what happens here.
Did anybody see this kind of problem, and how to solve this problem?
like
reload the switch, shut and no shut the interfaces.?
Thanks
Wei
At 09:47 PM 6/21/2003 -0500, Mike Williams wrote:
>Wei,
>
>Silly question: Do you have 'encapsulation frame-relay' on Serial2/0?
>I don't see that in your configs below. You are correct that on your
R2
>that on R2 the DLCIs are assigned to the physical interface, so there
is
>no need for a 'frame-relay interface-dlci' command. You are also
>correct that you don't need a mapping but that is because of
>inverse-arp, so be careful with that. Personally, I would map all IP
>addresses to their respective DLCI. The rules out ANY chance of you
>getting messed up by inverse-arp. I went to the lab and I configured
>two routers exactly as you have and it works fine for me. See
following
>output (I used R2 and R4 instead of R1 and R2, but it's the same
>thing):
>
>------------------------------------------------
>
>R2#sh run
>
>interface Serial1
> no ip address
> encapsulation frame-relay
>!
>interface Serial1.1 point-to-point
> ip address 192.168.1.5 255.255.255.252
> frame-relay interface-dlci 104
>
>R2#sh frame map
>Serial1.1 (up): point-to-point dlci, dlci 104(0x68,0x1880), broadcast
> status defined, active
>R2#ping 192.168.1.6
>
>Type escape sequence to abort.
>Sending 5, 100-byte ICMP Echos to 192.168.1.6, timeout is 2 seconds:
>!!!!!
>Success rate is 100 percent (5/5), round-trip min/avg/max = 8/8/8 ms
>R2#
>
>------------------------------------------------
>
>R4#sh run
>interface Serial0/0
> ip address 192.168.1.6 255.255.255.252
> encapsulation frame-relay
>
>R4#sh frame map
>Serial0/0 (up): ip 192.168.1.5 dlci 401(0x191,0x6410), dynamic,
> broadcast,, status defined, active
>R4#ping 192.168.1.5
>
>Type escape sequence to abort.
>Sending 5, 100-byte ICMP Echos to 192.168.1.5, timeout is 2 seconds:
>!!!!!
>Success rate is 100 percent (5/5), round-trip min/avg/max = 4/5/8 ms
>R4#
>
>------------------------------------------------
>
>I can't explain why you're getting that 0.0.0.0 in your 'frame map',
but
>something's not right. It should work for you as shown.
>
>HTH,
>Mike W.
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
>Wei Zou (wzou)
>Sent: Saturday, June 21, 2003 7:53 PM
>To: ccielab@groupstudy.com
>Subject: Frame Relay question
>
>
>Hi:
>I have following topology:
>
>Router1(r1) ---DLCI(130)-----FR switch ----DLCI( 131) ---- Router 2(r2)
>
>r1#sh run
>interface Serial2/0.2 point-to-point
> ip address 192.168.1.5 255.255.255.252
> frame-relay interface-dlci 130
>end
>
>r2#sh run int s2/0
>interface Serial2/0
> ip address 192.168.1.6 255.255.255.252
> encapsulation frame-relay
>end
>
>Why show frame map will show 0.0.0.0 entry for r2 and I can not ping
>192.168.1.5(r1 s2/0) from r2(I know I don't have entry to there, but
>why?I
>believe the PVC is automatically assigned to physical interfaces, I
>don't
>need interface-dlci or map statement).
>r2#sh frame map
>Serial2/0 (up): ip 0.0.0.0 dlci 131(0x83,0x2030)
> broadcast,
> CISCO, status defined, active
>
>why 0.0.0.0 entry is shown for physical interface side whenever I have
>physical interface connected to Multipoint or Point-to-Point
>subinterfaces.
>But it will not happen between Multipoint to Multipoint/PtP or PtP to
>PtP
>subinterfaces.?
>
>Thanks
>Wei
>
>
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