Re: [c-nsp] SXH3 ghost bugs - more details

2008-09-25 Thread Gert Doering
Hi,

On Tue, Sep 23, 2008 at 04:46:38PM -0400, Rodney Dunn wrote:
 Seems they are not planning a special rebuild for this unfortunately.

Mmmh, bad news.

 We are trying to get them to build a engineering special
 generally available for TAC if you have a SR open they should
 be able to get it.

That would work fine for us, though.

Thanks,

gert
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Re: [c-nsp] SXH3 ghost bugs - more details

2008-09-23 Thread Rodney Dunn
Gert,

Seems they are not planning a special rebuild for this unfortunately.

We are trying to get them to build a engineering special
generally available for TAC if you have a SR open they should
be able to get it.

Sorry...

Rodney


On Mon, Sep 22, 2008 at 09:04:45AM -0400, Rodney Dunn wrote:
 They are Gert.
 
 Let me check on it...
 
 On Sat, Sep 20, 2008 at 09:29:53PM +0200, Gert Doering wrote:
  Hi,
  
  On Fri, Sep 19, 2008 at 07:23:36PM +0200, Peter Rathlev wrote:
   CSCsu59917
   SXF15: IPv4/v6 BGP routes not cleared when source routes is gone
   Severity: 1 - catastrophic.
  
  Indeed... makes me wonder why they are not doing an SXH rebuild on their
  own, instead of making us wait 4-6 weeks for a bugfix for a *catastrophic*
  (!!) bug.
  
  (No news from our case yet regarding an interim rebuild)
  
  thanks,
  
  gert
  
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  Mobile communications ... right now writing from * Sardegna, Italy *
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Re: [c-nsp] SXH3 ghost bugs - more details

2008-09-22 Thread Rodney Dunn
On Fri, Sep 19, 2008 at 12:46:47PM -0500, Winders, Timothy A wrote:
 On 9/19/08 12:23 PM, Peter Rathlev [EMAIL PROTECTED] wrote:
 
  On Fri, 2008-09-19 at 18:51 +0200, Gert Doering wrote:
  On Thu, Sep 18, 2008 at 08:36:43PM -0400, Jared Mauch wrote:
  Your bug (CSCsu59917) should also be listed on CCO.
  cut
  What does CCO say about it, right now?  (Don't want to check - $very
  expensive GPRS link...)
  
  Probably not totally legal to post this, but here goes. :-)
  
  CSCsu59917
  SXF15: IPv4/v6 BGP routes not cleared when source routes is gone
  Severity: 1 - catastrophic.
  Status: Fixed.
  Fixed-In 
  12.2(18)SXF15
  12.2(33.3.11)SXH
  12.2(32.8.11)SX206
 
 I don't understand.  How can this show up in SXF15 and be fixed in SXF15?

Because when we pull the label there are a few more test cycles that
run pre-CCO post. If they find something catastrophic at the last minute
they will fix it if at all possible. That appears to be what happened here
with the SXF15 build and the bug that caused it.

They are pushing for a faster rebuild on SXH to get the fix also.

Rodney


 Or, am I reading this wrong?
 
 Tim Winders | Associate Dean of Information Technology | South Plains
 College
 
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Re: [c-nsp] SXH3 ghost bugs - more details

2008-09-22 Thread Rodney Dunn
They are Gert.

Let me check on it...

On Sat, Sep 20, 2008 at 09:29:53PM +0200, Gert Doering wrote:
 Hi,
 
 On Fri, Sep 19, 2008 at 07:23:36PM +0200, Peter Rathlev wrote:
  CSCsu59917
  SXF15: IPv4/v6 BGP routes not cleared when source routes is gone
  Severity: 1 - catastrophic.
 
 Indeed... makes me wonder why they are not doing an SXH rebuild on their
 own, instead of making us wait 4-6 weeks for a bugfix for a *catastrophic*
 (!!) bug.
 
 (No news from our case yet regarding an interim rebuild)
 
 thanks,
 
 gert
 
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Re: [c-nsp] SXH3 ghost bugs - more details

2008-09-22 Thread Winders, Timothy A
On 9/22/08 8:04 AM, Rodney Dunn [EMAIL PROTECTED] wrote:

 On Fri, Sep 19, 2008 at 12:46:47PM -0500, Winders, Timothy A wrote:
 On 9/19/08 12:23 PM, Peter Rathlev [EMAIL PROTECTED] wrote:
 
 On Fri, 2008-09-19 at 18:51 +0200, Gert Doering wrote:
 On Thu, Sep 18, 2008 at 08:36:43PM -0400, Jared Mauch wrote:
 Your bug (CSCsu59917) should also be listed on CCO.
 cut
 What does CCO say about it, right now?  (Don't want to check - $very
 expensive GPRS link...)
 
 Probably not totally legal to post this, but here goes. :-)
 
 CSCsu59917
 SXF15: IPv4/v6 BGP routes not cleared when source routes is gone
 Severity: 1 - catastrophic.
 Status: Fixed.
 Fixed-In 
 12.2(18)SXF15
 12.2(33.3.11)SXH
 12.2(32.8.11)SX206
 
 I don't understand.  How can this show up in SXF15 and be fixed in SXF15?
 
 Because when we pull the label there are a few more test cycles that
 run pre-CCO post. If they find something catastrophic at the last minute
 they will fix it if at all possible. That appears to be what happened here
 with the SXF15 build and the bug that caused it.
 
 They are pushing for a faster rebuild on SXH to get the fix also.

Thanks for the answer Rodney.  So, it was found in SXF15, but corrected
before SXF15 was pushed out the door.  Gotcha.

Tim Winders | Associate Dean of Information Technology | South Plains
College

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Re: [c-nsp] SXH3 ghost bugs - more details

2008-09-22 Thread Gert Doering
Hi,

On Mon, Sep 22, 2008 at 09:04:03AM -0400, Rodney Dunn wrote:
 They are pushing for a faster rebuild on SXH to get the fix also.

Cool!  Thank you very much (if you have been involved in this - if not,
at least for giving us some more background info).

gert
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Re: [c-nsp] SXH3 ghost bugs - more details

2008-09-19 Thread Gert Doering
Hi,

On Thu, Sep 18, 2008 at 08:36:43PM -0400, Jared Mauch wrote:
 On Thu, Sep 18, 2008 at 10:13:16PM +0200, Gert Doering wrote:
  On Tue, Sep 16, 2008 at 06:58:49PM +0200, Gert Doering wrote:
I've got no bug ID, but it's on case SR 609537689.  
   Thanks.  I'll forward this - and let's see what will happen.
  
  Updates.  I now have a bug ID, CSCsu59917, which turns out to be a
  duplicate of an internal bug ID (ID not known because it's internal),
  which is supposed to be fixed in SXH4 to be released in 4-5 weeks.
 
   If it's experienced in a customer network, they should change the bug
 to found-in: customer-use and make the bug available on CCO.

I agree...

   If they do not, escalate the case.

... but this is a bit difficult right now - I'm on vacation,
technically, and thus I'm a bit handicapped regarding escalation things.

So this will have to wait a few days.  Hopefully they will at least be
able to do a SXH3 interim rebuild in the mean time. (I'll check with
the developers).

  We'll raise a stink about this since it's seriously impacting our
  routing and I'm not really willing to wait for 4 weeks of daily routing
  loops...
   Your bug (CSCsu59917) should also be listed on CCO.

What does CCO say about it, right now?  (Don't want to check - $very 
expensive GPRS link...)

gert

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Mobile communications ... right now writing from * Sardegna, Italy *
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Re: [c-nsp] SXH3 ghost bugs - more details

2008-09-19 Thread Peter Rathlev
On Fri, 2008-09-19 at 18:51 +0200, Gert Doering wrote:
 On Thu, Sep 18, 2008 at 08:36:43PM -0400, Jared Mauch wrote:
  Your bug (CSCsu59917) should also be listed on CCO.
cut
 What does CCO say about it, right now?  (Don't want to check - $very 
 expensive GPRS link...)

Probably not totally legal to post this, but here goes. :-)

CSCsu59917
SXF15: IPv4/v6 BGP routes not cleared when source routes is gone
Severity: 1 - catastrophic.
Status: Fixed.
Fixed-In 
12.2(18)SXF15
12.2(33.3.11)SXH
12.2(32.8.11)SX206


Regards,
Peter

(And then a 256-line .sig...)

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Re: [c-nsp] SXH3 ghost bugs - more details

2008-09-19 Thread Winders, Timothy A
On 9/19/08 12:23 PM, Peter Rathlev [EMAIL PROTECTED] wrote:

 On Fri, 2008-09-19 at 18:51 +0200, Gert Doering wrote:
 On Thu, Sep 18, 2008 at 08:36:43PM -0400, Jared Mauch wrote:
 Your bug (CSCsu59917) should also be listed on CCO.
 cut
 What does CCO say about it, right now?  (Don't want to check - $very
 expensive GPRS link...)
 
 Probably not totally legal to post this, but here goes. :-)
 
 CSCsu59917
 SXF15: IPv4/v6 BGP routes not cleared when source routes is gone
 Severity: 1 - catastrophic.
 Status: Fixed.
 Fixed-In 
 12.2(18)SXF15
 12.2(33.3.11)SXH
 12.2(32.8.11)SX206

I don't understand.  How can this show up in SXF15 and be fixed in SXF15?
Or, am I reading this wrong?

Tim Winders | Associate Dean of Information Technology | South Plains
College

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Re: [c-nsp] SXH3 ghost bugs - more details

2008-09-18 Thread Gert Doering
Hi,

On Tue, Sep 16, 2008 at 06:58:49PM +0200, Gert Doering wrote:
  I've got no bug ID, but it's on case SR 609537689.  
 Thanks.  I'll forward this - and let's see what will happen.

Updates.  I now have a bug ID, CSCsu59917, which turns out to be a
duplicate of an internal bug ID (ID not known because it's internal),
which is supposed to be fixed in SXH4 to be released in 4-5 weeks.

We'll raise a stink about this since it's seriously impacting our
routing and I'm not really willing to wait for 4 weeks of daily routing
loops...

gert
-- 
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Mobile communications ... right now writing from * Sardegna, Italy *
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Re: [c-nsp] SXH3 ghost bugs - more details

2008-09-16 Thread Gert Doering
Hi,

On Mon, Sep 15, 2008 at 12:56:08PM -0700, Christopher McCrory wrote:
 I'm curious, is bgp dampening on or off?

BGP dampening is off.

gert
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Re: [c-nsp] SXH3 ghost bugs - more details

2008-09-16 Thread Gert Doering
Hi,

On Mon, Sep 15, 2008 at 09:11:14PM +0100, Peter Taphouse wrote:
 Just to second (or third?) this bug.  We've got four 7600s on SXH3 which
  are afflicted by this - they were upgraded from 2a on tac's advise (to
 avoid netflow bug related spontaneous reloads) - and we don't use
 dampening.  It doesn't seem to matter if the prefixes that get withdrawn
 are i or ebgp, they get still ghosted to other ibgp peers.  

For iBGP-iBGP ghosts, our current setup is not suitable (read: no
route-reflector setup, so iBGP-iBGP announcements would not take place),
thus I have no evidence on whether this would also trigger the bug for
us.  But I think it's quite likely indeed, given that this seems to 
happen on sending *out* the withdraw...

 I've got a case open with tac, 

Would you mind sharing the case number with me?  I could forward this to
our TAC engineer so they know this is not just us.

Do you have a bug ID?

 but it's causing us enough grief that I'm moving back to SXF until 
 things calm down.  

*grumble* - I would love to do that, given that we're quite happy with
SXF since about two years now.  But we were unlucky/stupid enough to
get Sup720-10Gs for these new boxes, and they only run SHX...

 Would love the new netflow stuff in SXH if it gets stable enough...

We're quite happy with the SHX3 netflow.  No crashes (yet, knock wood)
and the load on everything is indeed much lower.

There are some other funnies in SXH3, but these are just annoyances
and not service impacting (we're not using scp).

gert

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Re: [c-nsp] SXH3 ghost bugs - more details

2008-09-16 Thread Peter Taphouse
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1



 Would you mind sharing the case number with me?  I could forward this to
 our TAC engineer so they know this is not just us.
 
 Do you have a bug ID?

I've got no bug ID, but it's on case SR 609537689.  SXH3 introduced
another new bgp bug too - the output of show ip bgp neigh xx.xxx.xx.xx
advertised-routes produced badly wrong output. For example it showed us
announcing zero prefixes to one of our transit providers, even though
their looking glass showed them receiving them just fine :-/

That's why I opened the case originally, the ghosting bug I noticed
afterwards and then I quickly moved to SXF since it was causing too much
grief.

 but it's causing us enough grief that I'm moving back to SXF until 
 things calm down.  
 
 *grumble* - I would love to do that, given that we're quite happy with
 SXF since about two years now.  But we were unlucky/stupid enough to
 get Sup720-10Gs for these new boxes, and they only run SHX...

Just to make you feel better, the 7604 I reloaded yesterday with SXF15
just spontaneously reloaded...

- --
Peter Taphouse

Bytemark Hosting
http://www.bytemark.co.uk/
tel. +44 (0) 845 004 3 004
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Re: [c-nsp] SXH3 ghost bugs - more details

2008-09-15 Thread Gert Doering
Hi,

following up on this:

On Tue, Sep 02, 2008 at 08:33:08PM +0300, Adrian Minta wrote:
 Gert Doering wrote:
 On Tue, Sep 02, 2008 at 07:02:08PM +0300, Adrian Minta wrote:
  - the BGP ghost bug is back :-(

I have now managed to open a TAC case on this - in case you want to
open your own case and attach to it, it's SR 609533003.  We have no
BugID yet, TAC is trying to reproduce it.


In our network, reproducing the problem is fairly straightforward (and
I have demonstrated it to the TAC engineer, who then mumbled something
like I think you have found a bug here - surprise, surprise :) ):


Host H, AS 65500  --  Router A, AS 5539  Router B, AS 5539

Host H announces a single prefix via eBGP to Router A.

Router A has a bog standard iBGP session to Router B.  No(!) filters
of any kind between A and B.


Now inject instabilities - tear down the BGP session H-A, bring it
up again, wait a few minutes, tear it down again, and so on.  After
somewhat between 2 and 10 session down, the following happens:

- on Router A, the prefix completely drops from the BGP table

Cisco-A#sh ip b 193.31.7.1/32
% Network not in table

- on Router B, the prefix is still visible, via A:

Cisco-B#sh ip b 193.31.7.1/32
BGP routing table entry for 193.31.7.1/32, version 16726560
Paths: (1 available, best #1, table Default-IP-Routing-Table)
Flag: 0x820
  Advertised to update-groups:
 4
  65500
195.30.H.H (metric 3584) from 193.149.A.A (194.97.A.A) 
  Origin IGP, metric 0, localpref 100, valid, internal, best


it doesn't matter whether next-hop-self is used or whether B is 
a normal iBGP peer or a route-reflector-client (or whether a mixture of
normal peers and RR clients exists).  A just forgets - occasionally -
to send withdraws if it doesn't have the prefix any longer.

Of course A and B have full BGP tables - and as there is instability and
withdraws out there, we see this happen to about 5-20 prefixes per day.

It might have to do with the amount of normal updates going on in 
parallel - if there is lots of updates, then there is a propability 
that things will get lost.  But maybe not.  (I have not yet tested in
a pure lab environment, with no other BGP updates between A and B).


gert

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Re: [c-nsp] SXH3 ghost bugs - more details

2008-09-15 Thread Gert Doering
Hi,

On Mon, Sep 15, 2008 at 04:50:13PM +0200, Gert Doering wrote:
 Cisco-A#sh ip b 193.31.7.1/32
 % Network not in table
 
 Cisco-B#sh ip b 193.31.7.1/32
 BGP routing table entry for 193.31.7.1/32, version 16726560
 Paths: (1 available, best #1, table Default-IP-Routing-Table)
 Flag: 0x820
   Advertised to update-groups:
  4
   65500
 195.30.H.H (metric 3584) from 193.149.A.A (194.97.A.A) 
   Origin IGP, metric 0, localpref 100, valid, internal, best

Oh, and I've found a workaround what to do in this case - since doing a
clear ip bgp * soft doesn't work, and a and hard clear of all the iBGP 
sessions is a bit disturbative...

What you need to do is:

 - insert a static route for that prefix which gets distributed into BGP
 - remove static route

for us, this is straightfoward - we are redistributing static routes - bgp
based on route tags, so it's just ip route $prefix $mask tag  and
remove the route again, 5 seconds later.

gert

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Re: [c-nsp] SXH3 ghost bugs - more details

2008-09-15 Thread Christopher McCrory
Hello...

I'm curious, is bgp dampening on or off?




On Mon, 2008-09-15 at 16:50 +0200, Gert Doering wrote:
 Hi,
 
 following up on this:
 
 On Tue, Sep 02, 2008 at 08:33:08PM +0300, Adrian Minta wrote:
  Gert Doering wrote:
  On Tue, Sep 02, 2008 at 07:02:08PM +0300, Adrian Minta wrote:
   - the BGP ghost bug is back :-(
 
 I have now managed to open a TAC case on this - in case you want to
 open your own case and attach to it, it's SR 609533003.  We have no
 BugID yet, TAC is trying to reproduce it.
 
 
 In our network, reproducing the problem is fairly straightforward (and
 I have demonstrated it to the TAC engineer, who then mumbled something
 like I think you have found a bug here - surprise, surprise :) ):
 
 
 Host H, AS 65500  --  Router A, AS 5539  Router B, AS 5539
 
 Host H announces a single prefix via eBGP to Router A.
 
 Router A has a bog standard iBGP session to Router B.  No(!) filters
 of any kind between A and B.
 
 
 Now inject instabilities - tear down the BGP session H-A, bring it
 up again, wait a few minutes, tear it down again, and so on.  After
 somewhat between 2 and 10 session down, the following happens:
 
 - on Router A, the prefix completely drops from the BGP table
 
 Cisco-A#sh ip b 193.31.7.1/32
 % Network not in table
 
 - on Router B, the prefix is still visible, via A:
 
 Cisco-B#sh ip b 193.31.7.1/32
 BGP routing table entry for 193.31.7.1/32, version 16726560
 Paths: (1 available, best #1, table Default-IP-Routing-Table)
 Flag: 0x820
   Advertised to update-groups:
  4
   65500
 195.30.H.H (metric 3584) from 193.149.A.A (194.97.A.A) 
   Origin IGP, metric 0, localpref 100, valid, internal, best
 
 
 it doesn't matter whether next-hop-self is used or whether B is 
 a normal iBGP peer or a route-reflector-client (or whether a mixture of
 normal peers and RR clients exists).  A just forgets - occasionally -
 to send withdraws if it doesn't have the prefix any longer.
 
 Of course A and B have full BGP tables - and as there is instability and
 withdraws out there, we see this happen to about 5-20 prefixes per day.
 
 It might have to do with the amount of normal updates going on in 
 parallel - if there is lots of updates, then there is a propability 
 that things will get lost.  But maybe not.  (I have not yet tested in
 a pure lab environment, with no other BGP updates between A and B).
 
 
 gert
 
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To the optimist, the glass is half full.
To the pessimist, the glass is half empty.
To the engineer, the glass is twice as big as it needs to be.


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Re: [c-nsp] SXH3 ghost bugs - more details

2008-09-15 Thread Peter Taphouse
Hello,

 I'm curious, is bgp dampening on or off?

Just to second (or third?) this bug.  We've got four 7600s on SXH3 which
 are afflicted by this - they were upgraded from 2a on tac's advise (to
avoid netflow bug related spontaneous reloads) - and we don't use
dampening.  It doesn't seem to matter if the prefixes that get withdrawn
are i or ebgp, they get still ghosted to other ibgp peers.  I don't
have any evidence whether or not the prefixes get withdrawn to ebgp
peers as we don't transit that many.

I've got a case open with tac, but it's causing us enough grief that I'm
moving back to SXF until things calm down.  Would love the new netflow
stuff in SXH if it gets stable enough...

-- 
Peter Taphouse

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Re: [c-nsp] SXH3 ghost bugs - more details

2008-09-15 Thread Church, Charles
From what I hear from our account people, SXF is considered a 'dead'
train, and you should move to SXH or SXI.  We've got a serious NAT bug
in SXF14 that they're claiming won't be fixed in SXF.  Sucks for our
huge Sup2 base.

Chuck

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Peter Taphouse
Sent: Monday, September 15, 2008 4:11 PM
To: cisco-nsp@puck.nether.net
Subject: Re: [c-nsp] SXH3 ghost bugs - more details


Hello,

 I'm curious, is bgp dampening on or off?

Just to second (or third?) this bug.  We've got four 7600s on SXH3 which
 are afflicted by this - they were upgraded from 2a on tac's advise (to
avoid netflow bug related spontaneous reloads) - and we don't use
dampening.  It doesn't seem to matter if the prefixes that get withdrawn
are i or ebgp, they get still ghosted to other ibgp peers.  I don't
have any evidence whether or not the prefixes get withdrawn to ebgp
peers as we don't transit that many.

I've got a case open with tac, but it's causing us enough grief that I'm
moving back to SXF until things calm down.  Would love the new netflow
stuff in SXH if it gets stable enough...

-- 
Peter Taphouse

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