topic RE: exos behavior then ipforwarding is disabled in ExtremeSwitching (EXOS/Switch Engine)

exos behavior then ipforwarding is disabled

Marius_Matijosi — Tue, 08 Nov 2016 14:58:00 GMT

my config
VLAN 1 IP adress is set, no ipforwarding, default route is set - gw is from same subnet.
VLAN 2 IP address is set, no ipforwarding.

I need management access from VLAN 2 subnet. Ex. there is Netsight in same VLAN/Subnet.
VLAN 1 should be used for connection to Radius.

in my case there is no need for ipforwarding between these two VLANs in the switch..

How does EXOS switch forward packets if there are two IPs set (in two VLANS) and ipforwarding is not enabled on both Vlans?
How does EXOS switch forward packets if there are two IPs set (in two VLANS) and ipforwarding is enabled for one VLAN only?

Could you advise how to configure switch for my scenario.
Thanks

RE: exos behavior then ipforwarding is disabled

simon_bingham — Tue, 08 Nov 2016 15:24:00 GMT

I tested this years ago ( and wrote down the results ) Excuse my scrappy visio

Conclusion

If ip forwarding is disabled the router will

NOT forward onto vlan that is disabled

NOT forward FROM the vlan that is disabled,

The slight is exception is if the router OWNs the ipaddress it will always respond

But any for any other addresses on the subnet ie not owned by the router itselfs traffic will not be forwarded

RE: exos behavior then ipforwarding is disabled

Ryan_Mathews — Tue, 08 Nov 2016 15:24:00 GMT

Wow....this is seriously impressive organization, note taking and recall Simon.

Appreciate you sharing with the Hub so others can take advantage of your good work in the future.

RE: exos behavior then ipforwarding is disabled

Marius_Matijosi — Wed, 09 Nov 2016 19:33:00 GMT

Thanks. It makes sense.