Alcatel-Lucent OmniSwitch 6900-T40 7.3R01 2 Default Gateway's Advice

[donovan2123]

Any Alcatel specialists ?

Need some advice, I have a client who is requesting 2 x Static Default Gateways something like this:

0.0.0.0/0 10.17.252 metric 1

0.0.0.0/0 10.18.0.252 metric 15

Originally it was asked so they could test the metric 15 default gateway OOH etc which I was fine with and assume you can have two default gateways with different metrics and metric 1 will always be first unless interface is down etc?

Problem is they have asked for us to do this with the intention of having different vlans routing to either one or the other on there request.

The reason they have asked for this is because they are putting a new WAN in which will include a NEW Router and New Firewall and they want to run both WAN's side by side so they can test etc.

I was okay about adding a second gateway with a higher metric but I am stumped with the idea of having say vlan1, vlan2, vlan3 routing to first default gateway 10.17.0. 252 and then having vlan4, vlan7 routing to second default gateway 10.18.0.252.

There present set up is a L3 Core Switch with Inter-vlan routing with one static default gateway. There is no routing protocol switched on i.e OSPF, RIP etc

[silvio]

Hi,

Originally it was asked so they could test the metric 15 default gateway OOH etc which I was fine with and assume you can have two default gateways with different metrics and metric 1 will always be first unless interface is down etc?

yes, the local ip interface of the first route has to be down for using the second route (metric 15). And this is only if the transfer metric to the GW is down.
I haven't fully understand the other request. But it sounds like PBR - policy based routing. Depending f.e. of the source of the traffic there will be used an other default GW. You have to configure a policy for it (and need the advanced license). You will find examples here in the forum and in the network guide.
best regards
Silvio

[donovan2123]

And this is only if the transfer metric to the GW is down.

Hi,

I haven't fully understand the other request. But it sounds like PBR - policy based routing. Depending f.e. of the source of the traffic there will be used an other default GW. You have to configure a policy for it (and need the advanced license). You will find examples here in the forum and in the network guide.
best regards
Silvio

Hi,

I think you are correct it is policy based routing of some sort. They asked if it were possible to have have say vlan1, 2 and 3 which all have IP Interfaces to route all unknown traffic via say the first default gateway which has the one metric and then route vlan4, 5 and 6 unknown traffic via the second default gateway?

[silvio]

yes its possible.
F.e. source traffic from vlan 1-3 with gw x.x.x.x and all other with gw y.y.y.y

Code: Select all

ip static route 0.0.0.0/0 gateway y.y.y.y
policy condition vl1 source vlan 1
policy condition vl2 source vlan 2
policy condition vl3 source vlan 3
policy action GW1 permanent gateway ip x.x.x.x
policy rule GW1 condition vl1 action GW1
policy rule GW2 condition vl2 action GW1
policy rule GW3 condition vl3 action GW1
qos apply

regards
Silvio