| Author |
Message |
Termite
Guest
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 Posted:
Mon Oct 17, 2005 8:50 pm Post subject:
Apparent MAC Table Corruption |
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We are running multiple DNS servers in Win 2003/AD environment. We have some
odd behavior going on where the Bridgehead server's MAC address gets
corrupted on the switching infrastructure. When we look at the ARP table,
the switch shows that the server's MAC address is actually out a different
port that it is. We have to go in and clear out the ARP entry in the subject
network switch, then all is OK.
We have no network loops, or anything, and this seems to ONLY affect these
servers, and not any of the roughly 100 or so others.
Has anyone seen anything similar? |
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2003AD
Guest
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| Posted:
Mon Oct 17, 2005 8:50 pm Post subject:
RE: Apparent MAC Table Corruption |
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Actually, we are seeing the same behavior here as well. I don't know if it
relates to our bridge head server or not but trying to rule out that
possiblity. We are a Nortel shop here, what are you using?
"Termite" wrote:
| Quote: | We are running multiple DNS servers in Win 2003/AD environment. We have some
odd behavior going on where the Bridgehead server's MAC address gets
corrupted on the switching infrastructure. When we look at the ARP table,
the switch shows that the server's MAC address is actually out a different
port that it is. We have to go in and clear out the ARP entry in the subject
network switch, then all is OK.
We have no network loops, or anything, and this seems to ONLY affect these
servers, and not any of the roughly 100 or so others.
Has anyone seen anything similar? |
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Termite
Guest
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| Posted:
Tue Oct 18, 2005 8:50 am Post subject:
RE: Apparent MAC Table Corruption |
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Is your name Mike?
TW
"2003AD" wrote:
| Quote: | Actually, we are seeing the same behavior here as well. I don't know if it
relates to our bridge head server or not but trying to rule out that
possiblity. We are a Nortel shop here, what are you using?
"Termite" wrote:
We are running multiple DNS servers in Win 2003/AD environment. We have some
odd behavior going on where the Bridgehead server's MAC address gets
corrupted on the switching infrastructure. When we look at the ARP table,
the switch shows that the server's MAC address is actually out a different
port that it is. We have to go in and clear out the ARP entry in the subject
network switch, then all is OK.
We have no network loops, or anything, and this seems to ONLY affect these
servers, and not any of the roughly 100 or so others.
Has anyone seen anything similar? |
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| Back to top |
|
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Ace Fekay [MVP]
Guest
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| Posted:
Tue Oct 18, 2005 9:47 pm Post subject:
Re: Apparent MAC Table Corruption |
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In news:0D77FE95-39E6-4868-BB82-2CD3C8B1DE4A@microsoft.com,
Termite <Termite@discussions.microsoft.com> made this post, which I then
commented about below:
| Quote: | We are running multiple DNS servers in Win 2003/AD environment. We
have some odd behavior going on where the Bridgehead server's MAC
address gets corrupted on the switching infrastructure. When we look
at the ARP table, the switch shows that the server's MAC address is
actually out a different port that it is. We have to go in and clear
out the ARP entry in the subject network switch, then all is OK.
We have no network loops, or anything, and this seems to ONLY affect
these servers, and not any of the roughly 100 or so others.
Has anyone seen anything similar?
|
Is your DC bridghead multi-homed (dual NICs)?
--
Ace
This posting is provided "AS-IS" with no warranties or guarantees and
confers no rights.
If this post is viewed at a non-Microsoft community website, and you were to
respond to it through that community's website, I may not see your reply
unless that website posts replies back to the original Microsoft forum.
Therefore, please direct all replies ONLY to the Microsoft public newsgroup
this thread originated in so all can benefit or ensure the web community
posts it back to the original forum.
Ace Fekay, MCSE 2003 & 2000, MCSA 2003 & 2000, MCSE+I, MCT, MVP
Microsoft Windows MVP - Windows Server - Directory Services
Microsot Certified Trainer
Infinite Diversities in Infinite Combinations.
================================= |
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2003AD
Guest
|
| Posted:
Thu Oct 20, 2005 4:50 pm Post subject:
Re: Apparent MAC Table Corruption |
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The servers are not multi-homed. The servers are HP 380 G3's. By default,
these servers have 1 bulit in NIC with two ports. At this point we only have
one port physically connected to the network and still see this behavior. We
have about 350 servers in our enviroment and about half are 2003. As far as
we can tell, it's only happening on the 3 DC's in the main site or same AD
Site.
2003AD
"Ace Fekay [MVP]" wrote:
| Quote: | In news:0D77FE95-39E6-4868-BB82-2CD3C8B1DE4A@microsoft.com,
Termite <Termite@discussions.microsoft.com> made this post, which I then
commented about below:
We are running multiple DNS servers in Win 2003/AD environment. We
have some odd behavior going on where the Bridgehead server's MAC
address gets corrupted on the switching infrastructure. When we look
at the ARP table, the switch shows that the server's MAC address is
actually out a different port that it is. We have to go in and clear
out the ARP entry in the subject network switch, then all is OK.
We have no network loops, or anything, and this seems to ONLY affect
these servers, and not any of the roughly 100 or so others.
Has anyone seen anything similar?
Is your DC bridghead multi-homed (dual NICs)?
--
Ace
This posting is provided "AS-IS" with no warranties or guarantees and
confers no rights.
If this post is viewed at a non-Microsoft community website, and you were to
respond to it through that community's website, I may not see your reply
unless that website posts replies back to the original Microsoft forum.
Therefore, please direct all replies ONLY to the Microsoft public newsgroup
this thread originated in so all can benefit or ensure the web community
posts it back to the original forum.
Ace Fekay, MCSE 2003 & 2000, MCSA 2003 & 2000, MCSE+I, MCT, MVP
Microsoft Windows MVP - Windows Server - Directory Services
Microsot Certified Trainer
Infinite Diversities in Infinite Combinations.
=================================
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2003AD
Guest
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| Posted:
Thu Oct 20, 2005 4:50 pm Post subject:
RE: Apparent MAC Table Corruption |
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Hey, I take it this is Terry:)
MB
"Termite" wrote:
| Quote: | Is your name Mike?
TW
"2003AD" wrote:
Actually, we are seeing the same behavior here as well. I don't know if it
relates to our bridge head server or not but trying to rule out that
possiblity. We are a Nortel shop here, what are you using?
"Termite" wrote:
We are running multiple DNS servers in Win 2003/AD environment. We have some
odd behavior going on where the Bridgehead server's MAC address gets
corrupted on the switching infrastructure. When we look at the ARP table,
the switch shows that the server's MAC address is actually out a different
port that it is. We have to go in and clear out the ARP entry in the subject
network switch, then all is OK.
We have no network loops, or anything, and this seems to ONLY affect these
servers, and not any of the roughly 100 or so others.
Has anyone seen anything similar? |
|
|
| Back to top |
|
|
Ace Fekay [MVP]
Guest
|
| Posted:
Fri Oct 21, 2005 8:51 am Post subject:
Re: Apparent MAC Table Corruption |
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|
In news:388489E0-EBAB-4F13-B93F-481D02164E55@microsoft.com,
2003AD <2003AD@discussions.microsoft.com> made this post, which I then
commented about below:
| Quote: | The servers are not multi-homed. The servers are HP 380 G3's. By
default, these servers have 1 bulit in NIC with two ports. At this
point we only have one port physically connected to the network and
still see this behavior. We have about 350 servers in our enviroment
and about half are 2003. As far as we can tell, it's only happening
on the 3 DC's in the main site or same AD Site.
2003AD
|
I would suggest to do a netmon capture to see exactly what is happening with
communication from the DCs to the switches. Have you checked Nortel for any
issues?
Ace |
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2003AD
Guest
|
| Posted:
Sun Oct 23, 2005 12:50 am Post subject:
Re: Apparent MAC Table Corruption |
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There was a similar issue with how Nortel sees 2003 traffic, but from my
understanding it pertained more to servers that were running in a cluster.
We'll try to get a capture next time it happens.
"Ace Fekay [MVP]" wrote:
| Quote: | In news:388489E0-EBAB-4F13-B93F-481D02164E55@microsoft.com,
2003AD <2003AD@discussions.microsoft.com> made this post, which I then
commented about below:
The servers are not multi-homed. The servers are HP 380 G3's. By
default, these servers have 1 bulit in NIC with two ports. At this
point we only have one port physically connected to the network and
still see this behavior. We have about 350 servers in our enviroment
and about half are 2003. As far as we can tell, it's only happening
on the 3 DC's in the main site or same AD Site.
2003AD
I would suggest to do a netmon capture to see exactly what is happening with
communication from the DCs to the switches. Have you checked Nortel for any
issues?
Ace
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Ace Fekay [MVP]
Guest
|
| Posted:
Mon Oct 24, 2005 8:10 am Post subject:
Re: Apparent MAC Table Corruption |
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|
In news:5B42129C-4B21-4A6A-B7CE-209C504EECC1@microsoft.com,
2003AD <2003AD@discussions.microsoft.com> made this post, which I then
commented about below:
| Quote: | There was a similar issue with how Nortel sees 2003 traffic, but from
my understanding it pertained more to servers that were running in a
cluster. We'll try to get a capture next time it happens.
|
Curious how you make out. Post back please!
Ace |
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2003AD
Guest
|
| Posted:
Tue Nov 01, 2005 9:50 pm Post subject:
Re: Apparent MAC Table Corruption |
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Our network group changed the FDR timeout from 300 to 600 on the Nortel
Router. So far we have not seen the MAC corruptions.
"Ace Fekay [MVP]" wrote:
| Quote: | In news:5B42129C-4B21-4A6A-B7CE-209C504EECC1@microsoft.com,
2003AD <2003AD@discussions.microsoft.com> made this post, which I then
commented about below:
There was a similar issue with how Nortel sees 2003 traffic, but from
my understanding it pertained more to servers that were running in a
cluster. We'll try to get a capture next time it happens.
Curious how you make out. Post back please!
Ace
|
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Ace Fekay [MVP]
Guest
|
| Posted:
Wed Nov 02, 2005 9:50 am Post subject:
Re: Apparent MAC Table Corruption |
|
|
In news:65AFE5CC-6F8E-4ED9-8872-2F00BC622133@microsoft.com,
2003AD <2003AD@discussions.microsoft.com> made this post, which I then
commented about below:
| Quote: | Our network group changed the FDR timeout from 300 to 600 on the
Nortel Router. So far we have not seen the MAC corruptions.
|
Interesting that the Frame Delivery Ratio would have anything to do with it.
Curious, do you have additional info on this and why it would corrupt MAC
addresses?
Thanks,
Ace |
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2003AD
Guest
|
| Posted:
Wed Nov 09, 2005 5:50 pm Post subject:
Re: Apparent MAC Table Corruption |
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Not from my end. I am not quite sure the network group understands why this
seems to have fixed the issue, or atleast we have not seen it since the
change. It was a recommendation from Nortel Engineers. I'll see if I can
dig up and more info for you.
"Ace Fekay [MVP]" wrote:
| Quote: | In news:65AFE5CC-6F8E-4ED9-8872-2F00BC622133@microsoft.com,
2003AD <2003AD@discussions.microsoft.com> made this post, which I then
commented about below:
Our network group changed the FDR timeout from 300 to 600 on the
Nortel Router. So far we have not seen the MAC corruptions.
Interesting that the Frame Delivery Ratio would have anything to do with it.
Curious, do you have additional info on this and why it would corrupt MAC
addresses?
Thanks,
Ace
|
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Ace Fekay [MVP]
Guest
|
| Posted:
Thu Nov 10, 2005 1:51 am Post subject:
Re: Apparent MAC Table Corruption |
|
|
In news:9AA1FB6F-6711-443C-9C89-D7976AB82964@microsoft.com,
2003AD <2003AD@discussions.microsoft.com> made this post, which I then
commented about below:
| Quote: | Not from my end. I am not quite sure the network group understands
why this seems to have fixed the issue, or atleast we have not seen
it since the change. It was a recommendation from Nortel Engineers.
I'll see if I can dig up and more info for you.
|
That would be extermely appreciated. I am curious how they came up with that
one.
:-)
Ace |
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