Yep! At least that's what we think was happening, not 100% sure.
Re-orienting the cabling and punching down the connections again seemed to
alleviate the problem. I admit, it was pretty odd, but we were sharing the
demarc with a grocery store that had a room full of equipment that included
datacomm stuff as well as their large compressors for the freezers and stuff
like that. My guess is that one piece of equipment was the culprit, and
whenever it turned on....bamm...down goes the PVC. Then, a few minutes
later, the errors would go away and the line would come back up clean.
John
> Really? You had the same PVC dropping regularly because of EM? Dang,
that's
> weird! I've been playing with the idea of taking one of those home study
> courses in basic electrical theory. Maybe I oughta go ahead and do that;
> might clear up some ideas in my head. =)
>
> - Don
>
> -----Original Message-----
> From: John Neiberger [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, January 03, 2001 9:41 AM
> To: [EMAIL PROTECTED]
> Subject: RE: Frame Relay PVC
>
>
> I've experienced these types of symptoms several times and 99% of the
time
> it really is the telco's fault, it just takes some serious pressure to
get
> them to put some resources toward fixing the problem.
>
> However, at least once I found that it was a bad extension from the
demarc
> (NIU) to the csu/dsu. The building we were in had lots of other
equipment
> at the demarc, and from time to time throughout the day some of that
> equipment would generate enough EM noise that it would cause a lot of
errors
> on our line and the PVC would go down.
>
> The telco tested and didn't find any problems and even sent a tech who
> didn't discover any problems. I later went there myself and re-oriented
> some of the cables in relation to other equipment and the problem went
away.
>
> > My first and last inclination (not to mention every inclination in
> between)
> > is to blame the telco. If they've truly done testing on the circuit
and
> > can't find anything, then consider whether you cross multiple carriers
on
> > that PVC. It may not be your local carrier's issue, which is why they
> > haven't found anything. If you're on a single carrier, then I would
> > recommend a redesign of that PVC. It's easy to say there's nothing
wrong
> > with the configuration of the PVC when you're talking with someone who
> > doesn't know all the ins and outs of frame switch configuration, but
in
> my
> > experience, most of the carrier techs don't really KNOW their
equipment -
> > they just have a script they run through to create new PVCs, hence
they
> may
> > not be exactly accurate when they say that everything is fine.
> >
> > Hope that helps.
> >
> > - Don
> >
> > -----Original Message-----
> > From: Radford Dion [mailto:[EMAIL PROTECTED]]
> > Sent: Wednesday, January 03, 2001 8:46 AM
> > To: [EMAIL PROTECTED]
> > Subject: Frame Relay PVC
> >
> >
> >
> > I have a intermittent problem (about a dozen times a day) where a PVC
> goes
> > from the active to inactive state. It used to happen maybe once a
week. I
> > have not changed anything on either router. Furthermore, my other
PVC's
> are
> > unaffected.
> >
> > I did a debug of the lmi packets and the output is below. My telco
says
> > there is nothing wrong with the physical connection or the
configuration
> of
> > the PVC. If anyone has an explanation for these events, or even
better, a
> > solution to fix the damn thing, I'd love to hear it.
> >
> > Thanks,
> >
> > Dion
> >
> > Serial0(in): Status, myseq 89
> > RT IE 1, length 1, type 0
> > KA IE 3, length 2, yourseq 193, myseq 89
> > PVC IE 0x7 , length 0x3 , dlci 235, status 0x2
> > PVC IE 0x7 , length 0x3 , dlci 250, status 0x2
> > PVC IE 0x7 , length 0x3 , dlci 271, status 0x0
> > *Jan 3 10:23:37: %FR-5-DLCICHANGE: Interface Serial0 - DLCI 271 state
> > changed to INACTIVE
> > *Jan 3 10:23:37: %LINEPROTO-5-UPDOWN: Line protocol on Interface
> Serial0.1,
> > changed state to down
> > PVC IE 0x7 , length 0x3 , dlci 750, status 0x2
> > Serial0(out): StEnq, myseq 90, yourseen 193, DTE up
> > datagramstart = 0x401D66CC, datagramsize = 14
> > FR encap = 0x00010308
> > 00 75 95 01 01 01 03 02 5A C1
> >
> > Serial0(in): Status, myseq 90
> > RT IE 1, length 1, type 1
> > KA IE 3, length 2, yourseq 194, myseq 90
> > Serial0(out): StEnq, myseq 91, yourseen 194, DTE up
> > datagramstart = 0x40001338, datagramsize = 14
> > FR encap = 0x00010308
> > 00 75 95 01 01 01 03 02 5B C2
> >
> > Serial0(in): Status, myseq 91
> > RT IE 1, length 1, type 1
> > KA IE 3, length 2, yourseq 195, myseq 91
> > Serial0(out): StEnq, myseq 91, yourseen 194, DTE up
> > datagramstart = 0x40001338, datagramsize = 14
> > FR encap = 0x00010308
> > 00 75 95 01 01 01 03 02 5B C2
> >
> > Serial0(in): Status, myseq 91
> > RT IE 1, length 1, type 1
> > KA IE 3, length 2, yourseq 195, myseq 91
> > Serial0(out): StEnq, myseq 92, yourseen 195, DTE up
> > datagramstart = 0x402295A0, datagramsize = 14
> > FR encap = 0x00010308
> > 00 75 95 01 01 01 03 02 5C C3
> >
> > Serial0(in): Status, myseq 92
> > RT IE 1, length 1, type 1
> > KA IE 3, length 2, yourseq 196, myseq 92
> > Serial0(out): StEnq, myseq 93, yourseen 196, DTE up
> > datagramstart = 0x40000FB4, datagramsize = 14
> > FR encap = 0x00010308
> > 00 75 95 01 01 01 03 02 5D C4
> >
> > Serial0(in): Status, myseq 93
> > RT IE 1, length 1, type 1
> > KA IE 3, length 2, yourseq 197, myseq 93
> > Serial0(out): StEnq, myseq 94, yourseen 197, DTE up
> > datagramstart = 0x401D5E9C, datagramsize = 14
> > FR encap = 0x00010308
> > 00 75 95 01 01 01 03 02 5E C5
> >
> > Serial0(in): Status, myseq 94
> > RT IE 1, length 1, type 1
> > KA IE 3, length 2, yourseq 198, myseq 94
> > Serial0(out): StEnq, myseq 95, yourseen 198, DTE up
> > datagramstart = 0x400003FC, datagramsize = 14
> > FR encap = 0x00010308
> > 00 75 95 01 01 00 03 02 5F C6
> >
> > Serial0(in): Status, myseq 95
> > RT IE 1, length 1, type 0
> > KA IE 3, length 2, yourseq 199, myseq 95
> > PVC IE 0x7 , length 0x3 , dlci 235, status 0x2
> > PVC IE 0x7 , length 0x3 , dlci 250, status 0x2
> > PVC IE 0x7 , length 0x3 , dlci 271, status 0x2
> > *Jan 3 10:24:37: %FR-5-DLCICHANGE: Interface Serial0 - DLCI 271 state
> > changed to ACTIVE
> > *Jan 3 10:24:37: %LINEPROTO-5-UPDOWN: Line protocol on Interface
> Serial0.1,
> > changed state to up
> > PVC IE 0x7 , length 0x3 , dlci 750, status 0x2
> > Serial0(out): StEnq, myseq 96, yourseen 199, DTE up
> > datagramstart = 0x400003FC, datagramsize = 14
> > FR encap = 0x00010308
> > 00 75 95 01 01 01 03 02 60 C7
> >
> >
> > Configs:
> > Router A:
> >
> > interface Serial0
> > no ip address
> > encapsulation frame-relay
> > bandwidth 256
> > frame-relay lmi-type ansi
> > !
> > interface Serial0.1 point-to-point
> > ip address 172.19.148.254 255.255.255.0
> > frame-relay interface-dlci 271
> >
> >
> > Router B:
> >
> > interface Serial1
> > no ip address
> > encapsulation frame-relay
> > bandwidth 64
> > no fair-queue
> > frame-relay lmi-type ansi
> > !
> > interface Serial1.1 point-to-point
> > ip address 172.19.148.253 255.255.255.0
> > frame-relay interface-dlci 240
> >
> >
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