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Author Topic: VLAN Trunk between Nortel & Cisco  (Read 2857 times)

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Offline stevenahmet

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VLAN Trunk between Nortel & Cisco
« on: April 23, 2015, 12:17:11 AM »
Hi,

I've got a Nortel ERS 5510-48T, a Cisco SG 300-28P, a WatchGuard XTM510 firewall and an OpenMesh wireless access point.
The AP supports 2 SSIDs with different VLANs for each.

I've got this working with the individual switches, ie the AP connected to the Cisco, connected to the firewall.
And the AP connected to the Nortel, connected to the firewall.

The AP needs to obtain an IP address from DHCP when it boots. It can only do this through an untagged VLAN port. So, the configurations that are working at the moment are;

AP - configured with VLAN 30 on SSID1 & VLAN 40 on SSID2.
AP connected to Cisco on port 10.
Port 10 configured on Cisco as 30T, 40T, 50UP.
Port 8 is connected to WatchGuard. Port is configured as 30T, 40T, 50UP.
Watchguard is configured with the 3 VLANS, 30, 40 & 50. It's accepting tagged frames on VLANs 30 & 40, and untagged on VLAN 50. All 3 VLANS are configured with DHCP pools for their corresponding subnets.
The AP is successfully able to get an IP address from the untagged VLAN 50.
The wireless clients get an IP address from the respective VLANs depending on if they connect to SSID1 or SSID2.

On the Nortel, I've got the same 3 VLANs configured.
AP connected to port 26. The port is configured as;
VLAN members 30, 40, 50.
Filter Untagged Frames: No
Filter Unregistered Frames: No
PVID 50
UntagPVIDonly

Port 24 is connected to the WatchGuard. The port is configured same as port 26.
The AP gets its IP address from VLAN 50, and the wireless clients all work.

Now the problem.......

I need access ports split across floors. I've only got one Cisco SG300-28P on Level 5, but I've got Nortel stacks on both Level 5 and 6.

I need to connect the Cisco and the Nortel together whilst passing all the VLAN info.
If I connect the AP to the Nortel on port 26, connect port 24 of the Nortel to port 10 on the Cisco, and port 8 on the Cisco to the Watchguard, the access point doesn't work.

It's not getting it's DHCP address, so nothing else works.

So I'm just wondering why that untagged VLAN 50 port is not passing between switches, and if there's a way to get it working.

Thanks.


Offline Dominik

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Re: VLAN Trunk between Nortel & Cisco
« Reply #1 on: April 23, 2015, 01:21:06 AM »
How do you have configured the switch to switch connection from the Avaya to the Cisco switch ?
Here you should have configured on the Avaya switch tagAll and added all the needed VLANs.
On the Cisco switch you need a trunk port and for the case you use the allowed Vlan command you need to add here all the needed vlans, too.

Cheers
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networkautobahn.com

Offline stevenahmet

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Re: VLAN Trunk between Nortel & Cisco
« Reply #2 on: April 23, 2015, 06:38:24 PM »
I did have the switch to switch connection configured as;
Nortel - Untag PVID Only with VLAN 50 as PVID and VLAN 30, 40 as members
Cisco - Trunk port - 30T, 40T, 50UP

I tried your suggestion;
Nortel - TagAll with VLAN 50 as PVID and VLAN 30, 40 as members
Cisco - Same as above

Still doesn't work.

Offline stevenahmet

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Re: VLAN Trunk between Nortel & Cisco
« Reply #3 on: April 23, 2015, 10:27:28 PM »
Not sure what else to try.
Do I need to look at STP?
Wouldn't have a clue where to start, but will give it a go if it's required to make this work.

Offline stevenahmet

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Re: VLAN Trunk between Nortel & Cisco
« Reply #4 on: April 24, 2015, 12:03:15 AM »
It was STP. Port 24 that connected the Cisco to the Nortel switch was the alternate port and was in a discarding state.

I've disabled STP on that port for now, and the AP works as expected.

I just gotta work out how to implement STP properly.

Offline Dominik

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Re: VLAN Trunk between Nortel & Cisco
« Reply #5 on: April 24, 2015, 02:38:32 AM »
Looks like you have different STP versions running on your Cisco and Avaya switches. On Cisco the default is
PVST and on the Avaya is the standard STP the default.

You need the same STP Version on both Switches.

Cheers
Itīs always the networks fault!
networkautobahn.com