Jumbo frames and Veritas?

I have two W2K3 SP1 Std. Ed. servers both with Intel Pro/1000 MT server
adapters. One has E2K3 SP1 Std Ed. with Backup Exec 9.1 SP4a and a DDS4 tape
backup unit. The other is a DC and a file server with the Remote Agent.
Before I upped the frame size of both NICS to 9014 bytes on the two servers,
Backup Exec downloaded and backed up the data from the file server/DC with
the Remote Agent on it just fine. However, after I upped the frame size from
the usual default size (1518 bytes) to 9014 bytes Backup Exec hasn't been
able to see the file server/DC with the Remote Agent. Both servers can ping
each other successfully and swap files using UNC and IP successfully. The
topology is a flat single subnet network. Both servers are plugged into an
SMC 8505T switch which supports said frame size. I tried to reinstall the
Remote Agent by pushing it up from the server that has Backup Exec on it but
it can't find the file server/DC. Any ideas?
Stacey

Probably an unsupported frame size in the Backup Exec application. I would
make sure BE can actually use this config before I go any further...

Oliver

"5tac3" <(E-Mail Removed)> wrote in message
news:6DAAE50D-563A-476A-BF90-(E-Mail Removed)...
>I have two W2K3 SP1 Std. Ed. servers both with Intel Pro/1000 MT server
> adapters. One has E2K3 SP1 Std Ed. with Backup Exec 9.1 SP4a and a DDS4
> tape
> backup unit. The other is a DC and a file server with the Remote Agent.
> Before I upped the frame size of both NICS to 9014 bytes on the two
> servers,
> Backup Exec downloaded and backed up the data from the file server/DC with
> the Remote Agent on it just fine. However, after I upped the frame size
> from
> the usual default size (1518 bytes) to 9014 bytes Backup Exec hasn't been
> able to see the file server/DC with the Remote Agent. Both servers can
> ping
> each other successfully and swap files using UNC and IP successfully. The
> topology is a flat single subnet network. Both servers are plugged into
> an
> SMC 8505T switch which supports said frame size. I tried to reinstall the
> Remote Agent by pushing it up from the server that has Backup Exec on it
> but
> it can't find the file server/DC. Any ideas?
> Stacey

Thank you for the response Oliver. I, reluctantly, changed the Jumbo Frame
size from 9048 to 4088 on both servers and Backup Exec now works normally.
Strange that BE would be sensitive at the physical layer. It's as if Veritas
didn't take advantage of a networking API or something during development.
Stacey

"Oliver O'Boyle" wrote:

> Probably an unsupported frame size in the Backup Exec application. I would
> make sure BE can actually use this config before I go any further...
>
> Oliver
>
> "5tac3" <(E-Mail Removed)> wrote in message
> news:6DAAE50D-563A-476A-BF90-(E-Mail Removed)...
> >I have two W2K3 SP1 Std. Ed. servers both with Intel Pro/1000 MT server
> > adapters. One has E2K3 SP1 Std Ed. with Backup Exec 9.1 SP4a and a DDS4
> > tape
> > backup unit. The other is a DC and a file server with the Remote Agent.
> > Before I upped the frame size of both NICS to 9014 bytes on the two
> > servers,
> > Backup Exec downloaded and backed up the data from the file server/DC with
> > the Remote Agent on it just fine. However, after I upped the frame size
> > from
> > the usual default size (1518 bytes) to 9014 bytes Backup Exec hasn't been
> > able to see the file server/DC with the Remote Agent. Both servers can
> > ping
> > each other successfully and swap files using UNC and IP successfully. The
> > topology is a flat single subnet network. Both servers are plugged into
> > an
> > SMC 8505T switch which supports said frame size. I tried to reinstall the
> > Remote Agent by pushing it up from the server that has Backup Exec on it
> > but
> > it can't find the file server/DC. Any ideas?
> > Stacey
>
>
>

> Thank you for the response Oliver. I, reluctantly, changed the Jumbo
> Frame
> size from 9048 to 4088 on both servers and Backup Exec now works normally.
> Strange that BE would be sensitive at the physical layer. It's as if
> Veritas
> didn't take advantage of a networking API or something during development.
> Stacey

could be. You should contact them though, and identify the issue. It could
be a bug, or they may not have considered using the application in this
environment. They may wish to create a hotfix for you.

Good luck!
Oliver

>
> "Oliver O'Boyle" wrote:
>
>> Probably an unsupported frame size in the Backup Exec application. I
>> would
>> make sure BE can actually use this config before I go any further...
>>
>> Oliver
>>
>> "5tac3" <(E-Mail Removed)> wrote in message
>> news:6DAAE50D-563A-476A-BF90-(E-Mail Removed)...
>> >I have two W2K3 SP1 Std. Ed. servers both with Intel Pro/1000 MT server
>> > adapters. One has E2K3 SP1 Std Ed. with Backup Exec 9.1 SP4a and a
>> > DDS4
>> > tape
>> > backup unit. The other is a DC and a file server with the Remote
>> > Agent.
>> > Before I upped the frame size of both NICS to 9014 bytes on the two
>> > servers,
>> > Backup Exec downloaded and backed up the data from the file server/DC
>> > with
>> > the Remote Agent on it just fine. However, after I upped the frame
>> > size
>> > from
>> > the usual default size (1518 bytes) to 9014 bytes Backup Exec hasn't
>> > been
>> > able to see the file server/DC with the Remote Agent. Both servers can
>> > ping
>> > each other successfully and swap files using UNC and IP successfully.
>> > The
>> > topology is a flat single subnet network. Both servers are plugged
>> > into
>> > an
>> > SMC 8505T switch which supports said frame size. I tried to reinstall
>> > the
>> > Remote Agent by pushing it up from the server that has Backup Exec on
>> > it
>> > but
>> > it can't find the file server/DC. Any ideas?
>> > Stacey
>>
>>
>>