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Bridgehead DC [message #156192] Thu, 11 June 2009 13:18 Go to next message
Kerry  is currently offline Kerry
Messages: 48
Registered: July 2009
Member
Our AD Forest consists of an Empty Root and a Single Child Domain. We have a Hub and Spoke Model Replication Model, where we have both the Root and Child Domain DC's in the Hub Site and spoke sites have child domain DC's. One of the Child Domain DC is configured as a BH of the Hub Site. We are seeing errors in DCDIAG taken from a Root DC in the hub site like the one shown below:

"Preferred bridgehead servers have been selected to support intersite replication with the following site using the following transport. However, none of these preferred bridgehead servers can replicate the following directory partition." The partitions listed are all the Root Domain Partitions.

I would like to know:

1.Is it a good practise to assign a DC the role of a BH? or should that be auto selected, so that in case of any DC failure another DC in the same site can still perform that function?
2.Does the above error denote any major problems with respect to the Forest Root Zone replication to other remote DCs? or can this be ignored?
3.In what circumstances should we be using dedicated BH DC's?

Regards
--
Re: Bridgehead DC [message #156202 is a reply to message #156192] Thu, 11 June 2009 14:30 Go to previous messageGo to next message
Marcin  is currently offline Marcin
Messages: 273
Registered: July 2009
Senior Member
Kerry,

1. it is a common practice in environments where replication traffic is a
subject to firewall restrictions. The automatic failover, however, is a
factor in your decision - although you can mitigate it by designating
multiple bridgehead servers.
2. it does and it should not be. Is your bridgehead server configured as a
GC? If not, then it does not contain the read-only replica of the root
domain partition - hence the error (I assume that at least some of DCs in
remote sites are functioning as GCs - correct)?
3. in addition to the scenario I mentioned above (firewall restrictions),
using designated bridgehead server allows you to distribute replication load
when dealing with complex distributed environments (large number of remote
sites)

hth
Marcin


"Kerry" <Phanindra@live.com> wrote in message
news:OwAPeir6JHA.1712@TK2MSFTNGP03.phx.gbl...
Our AD Forest consists of an Empty Root and a Single Child Domain. We have a
Hub and Spoke Model Replication Model, where we have both the Root and Child
Domain DC's in the Hub Site and spoke sites have child domain DC's. One of
the Child Domain DC is configured as a BH of the Hub Site. We are seeing
errors in DCDIAG taken from a Root DC in the hub site like the one shown
below:

"Preferred bridgehead servers have been selected to support intersite
replication with the following site using the following transport. However,
none of these preferred bridgehead servers can replicate the following
directory partition." The partitions listed are all the Root Domain
Partitions.

I would like to know:

1.Is it a good practise to assign a DC the role of a BH? or should that be
auto selected, so that in case of any DC failure another DC in the same site
can still perform that function?
2.Does the above error denote any major problems with respect to the Forest
Root Zone replication to other remote DCs? or can this be ignored?
3.In what circumstances should we be using dedicated BH DC's?

Regards
Re: Bridgehead DC [message #156206 is a reply to message #156192] Thu, 11 June 2009 15:30 Go to previous messageGo to next message
RC  is currently offline RC  United States
Messages: 62
Registered: July 2009
Member
On Jun 11, 1:18 pm, "Kerry" <Phanin...@live.com> wrote:
> Our AD Forest consists of an Empty Root and a Single Child Domain. We have a Hub and Spoke Model Replication Model, where we have both the Root and Child Domain DC's in the Hub Site and spoke sites have child domain DC's. One of the Child Domain DC is configured as a BH of the Hub Site. We are seeing errors in DCDIAG taken from a Root DC in the hub site like the one shown below:
>
> "Preferred bridgehead servers have been selected to support intersite replication with the following site using the following transport. However, none of these preferred bridgehead servers can replicate the following directory partition." The partitions listed are all the Root Domain Partitions.
>
> I would like to know:
>
> 1.Is it a good practise to assign a DC the role of a BH? or should that be auto selected, so that in case of any DC failure another DC in the same site can still perform that function?
If you choose to manually configure only one DC in a site, The KCC
will not designate another as a Bridgehead server in the event
replication fails with the manually designated DC. Check out this link
http://support.microsoft.com/?kbid=271997

> 2.Does the above error denote any major problems with respect to the Forest Root Zone replication to other remote DCs? or can this be ignored?
YES

> 3.In what circumstances should we be using dedicated BH DC's?
Depends on your enviornment and situation. read this as it may be
helpful. http://support.microsoft.com/kb/271997

>
> Regards
Re: Bridgehead DC [message #156216 is a reply to message #156202] Thu, 11 June 2009 23:58 Go to previous messageGo to next message
Kerry  is currently offline Kerry
Messages: 48
Registered: July 2009
Member
Yes, the BH Server is a GC and i see from repadmin /showreps that it is
getting the updates for the Forest Root Zones from the Root DC's (Intrasite
Replication)

Are you suggesting to make one of the Root DC in hub site to also be a BH?

"Marcin" <marcin@community.nospam> wrote in message
news:6FCBB786-7E02-46B5-9101-F3F96576BEE0@microsoft.com...
> Kerry,
>
> 1. it is a common practice in environments where replication traffic is a
> subject to firewall restrictions. The automatic failover, however, is a
> factor in your decision - although you can mitigate it by designating
> multiple bridgehead servers.
> 2. it does and it should not be. Is your bridgehead server configured as a
> GC? If not, then it does not contain the read-only replica of the root
> domain partition - hence the error (I assume that at least some of DCs in
> remote sites are functioning as GCs - correct)?
> 3. in addition to the scenario I mentioned above (firewall restrictions),
> using designated bridgehead server allows you to distribute replication
> load when dealing with complex distributed environments (large number of
> remote sites)
>
> hth
> Marcin
>
>
> "Kerry" <Phanindra@live.com> wrote in message
> news:OwAPeir6JHA.1712@TK2MSFTNGP03.phx.gbl...
> Our AD Forest consists of an Empty Root and a Single Child Domain. We have
> a Hub and Spoke Model Replication Model, where we have both the Root and
> Child Domain DC's in the Hub Site and spoke sites have child domain DC's.
> One of the Child Domain DC is configured as a BH of the Hub Site. We are
> seeing errors in DCDIAG taken from a Root DC in the hub site like the one
> shown below:
>
> "Preferred bridgehead servers have been selected to support intersite
> replication with the following site using the following transport.
> However, none of these preferred bridgehead servers can replicate the
> following directory partition." The partitions listed are all the Root
> Domain Partitions.
>
> I would like to know:
>
> 1.Is it a good practise to assign a DC the role of a BH? or should that be
> auto selected, so that in case of any DC failure another DC in the same
> site can still perform that function?
> 2.Does the above error denote any major problems with respect to the
> Forest Root Zone replication to other remote DCs? or can this be ignored?
> 3.In what circumstances should we be using dedicated BH DC's?
>
> Regards
Re: Bridgehead DC [message #156220 is a reply to message #156192] Fri, 12 June 2009 03:37 Go to previous message
florian  is currently offline florian  Switzerland
Messages: 484
Registered: July 2009
Senior Member
Kerry,

Just a few notes from me on this:

Kerry schrieb:
> 1.Is it a good practise to assign a DC the role of a BH? or should that
> be auto selected, so that in case of any DC failure another DC in the
> same site can still perform that function?

If auto-selected, there are automatic fallback mechanisms as the KCC
will choose a new bh once the current fails. You could, if you wanted,
have multiple BHs selected, but the in case they all fail, KCC won't
manually pick a new one.

> 2.Does the above error denote any major problems with respect to the
> Forest Root Zone replication to other remote DCs? or can this be ignored?

Yeah. You're sure this is a one-forest one domain scenario? Keep in mind
that bridgeheads are assigned per NC, per site. Any NC that is not held
by the DC that is bridgehead server needs an additional bridgehead.

cheers,
Florian
--
Microsoft MVP - Group Policy
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