Ethernet Fabric (VDX, CNA)

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New Contributor
ssahraoui
Posts: 3
Registered: ‎11-28-2012

Network connectivity issue - Brocade Converged Switch

I have the following architecture. A BladeCenter H with a Brocade Converged switch and BNT 1/10 modules. Both Switches are connected to a Top of Rack (ToR) switch (BNT G8124) which is connected to Cisco 6509.

Brocade - ToR - Cisco

BNT1/10/

The problem:

All traffic passing by NICs connected to BNT 1/10 is working just fine with absolutely no problem.

All blades with Brocade CNA are not able to communicate with servers connected to the core switch.

Case 1:

When CNA is assigned VLAN 240 on Brc switch there's absolutely no communication (no ping - Destination host is unreachable) with servers connected to the core switch, however blades are able to communicate with rack servers attached to ToR directly

Case 2:

When CNA is assigned VLAN 220 on Brc swictch; the blades are able to ping all external servers without problems. However, when trying to copy a file for example from a server connected to the core switch the operation fail miserably

It smells like a VLAN issue but I'm not able the find the problem

I've attached the configuration of ToR and Brocade switches

NB: All blades are running Win2K8 R2

Can anybody help please?!

Moderator
Antonio Bongiorno TechHelp24
Posts: 3,804
Registered: ‎02-23-2004

Re: Network connectivity issue - Brocade Converged Switch

Hi,

--->>>...which is connected to Cisco 6509.

the Cisco 6509 is a Ethernet Switch or MDS ?

I can try to help with FCoE config, but no with Cisco IP Plattform.

BTW: i note the Brocade is current on FOS v6.3, is a bit old...

are you able to upgrade to v6.4.x ?

TechHelp24
New Contributor
ssahraoui
Posts: 3
Registered: ‎11-28-2012

Re: Network connectivity issue - Brocade Converged Switch

Hi,

The Cisco 6509 is an Ethernet core switch and i have no access to it.

Regarding upgrading brocade FOS I could do it but not right away.

New Contributor
ssahraoui
Posts: 3
Registered: ‎11-28-2012

Re: Network connectivity issue - Brocade Converged Switch

Well, I've found the issue! fcoeport require at least an MTU of 2500 bytes but the Cisco core switch isn't configured for that. Decreasing the MTU on the converged switch resolved the issue. For now I have to choose between disabling FC and working on 10G ethernet only or disabling ethernet and use FC until the core switch is replaced.

Moderator
Antonio Bongiorno TechHelp24
Posts: 3,804
Registered: ‎02-23-2004

Re: Network connectivity issue - Brocade Converged Switch

2500 is set by default.

value can range from 1522 to 9208

TechHelp24

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