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Author Topic: Avaya 3549GTS InterVLAN Routing  (Read 2481 times)

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Offline abrantes550

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Avaya 3549GTS InterVLAN Routing
« on: February 08, 2016, 01:01:24 PM »
Hi all,

I'm having a strange behavior with an Avaya 3549 switch,

I've created these vlans:
5    10005   192.168.5.252   255.255.255.0   10:CD:AE:61:7C:45 6      Enabled
50   10050   10.251.15.1     255.255.255.128 10:CD:AE:61:7C:42 3      Enabled
51   10051   10.251.15.193   255.255.255.224 10:CD:AE:61:7C:43 4      Enabled
55   10055   10.251.15.250   255.255.255.248 10:CD:AE:61:7C:40 1      Enabled
79   10079   192.168.79.253  255.255.255.0   10:CD:AE:61:7C:41 2      Enabled
82   10082   192.168.82.1    255.255.255.0   10:CD:AE:61:7C:44 5      Enabled

At this location i have 2 ISP providers.

Which are at port 1 and 2, they are different providers.

Port 1 ISP Router: 10.251.15.249
Port 2 ISP Router 192.168.82.253

A computer at vlan 50 (10.251.15.24) can't ping a computer at vlan 82 (192.168.82.200) but it can ping it's gateway (192.168.82.1)


Offline Johan Witters

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    • BKM Networks
Re: Avaya 3549GTS InterVLAN Routing
« Reply #1 on: February 09, 2016, 03:57:47 AM »
If you're able to ping the other vlan's gateway from 1 device, but not the end device, it's problably a bad gateway setting on the 'target' computer.
Kind regards,

Johan Witters

Network Engineer
BKM NV

Offline abrantes550

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Re: Avaya 3549GTS InterVLAN Routing
« Reply #2 on: February 09, 2016, 11:26:35 AM »
The target computer gateway is 192.168.82.1

Connected at the switch if i try ping 192.168.82.200 i can ping it but if i try ping 192.168.82.200 source 10.251.15.1 i cant reach it.

Also from VLAN 50(10.251.15.0) i cant ping a router at interface 2 which IP is 192.168.82.253

Offline abrantes550

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Re: Avaya 3549GTS InterVLAN Routing
« Reply #3 on: February 09, 2016, 06:20:55 PM »
Is it possible the issue is that i have 2 routers at diferentes subnets and using 10.251.15.249 has default gateway?

Offline Johan Witters

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Re: Avaya 3549GTS InterVLAN Routing
« Reply #4 on: February 09, 2016, 06:41:53 PM »
If your client has the ISP router as gateway, you should configure static routes on that router marking the paths for the other networks, pointing to the switch.

Or you can use your switch as default gateway for all connected subnets, activate routing (cli: ip routing /Gui IP->IP-> tick "forwarding" radio button) and add default routes to the ISP routers. On the routers, add static routes for the internal networks.
« Last Edit: February 09, 2016, 06:55:01 PM by Johan Witters »
Kind regards,

Johan Witters

Network Engineer
BKM NV

Offline abrantes550

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Re: Avaya 3549GTS InterVLAN Routing
« Reply #5 on: February 09, 2016, 07:28:06 PM »
I have the routes the issue is that i cant reach there.

I need to VLAN 50 (10.251.15.1) to use 192.168.82.253 to get to the internet and 10.251.15.249 when it goes to 10.0.0.0 the problems it that i cant reach anything in VLAN 82, so internet doesnt work there.

When i try ping 192.168.82.253 source 10.251.15.1 i cant reach it, 192.168.82.253 is a router

Offline abrantes550

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Re: Avaya 3549GTS InterVLAN Routing
« Reply #6 on: February 09, 2016, 07:38:53 PM »
Should i delete the default gateway 10.251.15.249 and let him use the routes?

I have a route 192.168.0.0 255.255.0.0 192.168.82.253

But 10.251.15.0 cant reach it, could it be the default gateway issue?

Offline Johan Witters

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Re: Avaya 3549GTS InterVLAN Routing
« Reply #7 on: February 10, 2016, 05:28:55 PM »
The easiest thing to do is the next:

1) configure the clients to use the switch as default gateway (15.1 and 82.1)
2) enable ip routing on the switch (cli: enable / config t / ip routing   or GUI: left menu "IP" -> "IP" -> check "Forwarding" -> click "Apply")
3) add static routes on the switch:
- ip route 0.0.0.0 0.0.0.0 192.168.82.253
- ip route 10.0.0.0 255.255.255.0 10.251.15.249
4) have static routes added on the ISP routers for your internal networks, next hop is the switch

You should now be able to ping clients in the different networks, and you should be able to reach the routers.

If not, run a traceroute and check the routing table on the switch and routers.
Kind regards,

Johan Witters

Network Engineer
BKM NV

Offline abrantes550

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Re: Avaya 3549GTS InterVLAN Routing
« Reply #8 on: February 10, 2016, 05:33:51 PM »
I feel like an idiot!

The router VLAN interface was 10.251.15.1 and the avaya VLAN interface was also 10.251.15.1

Just changed the avaya VLAN IP address and everything went fine.

Thanks for your help!

Offline Johan Witters

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Re: Avaya 3549GTS InterVLAN Routing
« Reply #9 on: February 10, 2016, 05:46:27 PM »
lol.. I know the issue, I've ran into it a few times myself..

Glad that you sorted it out..
Kind regards,

Johan Witters

Network Engineer
BKM NV