We have just migrated our core L3 interfaces and routing from Juniper switches to a Aruba 8325 VSX.
Since doing this we have found that Jumbo frames are no longing routing between VLANs. Such as a client on VLAN 2 trying to access a server on VLAN 3 with a packet larger than 1500.
We have enabled the command (MTU 9198) on the physical interfaces that uplink to the rest of the network already.
We have logged a call with support but they appear to be just guessing what is required and don't really know. Basically just saying try this or that.
We believe we need to enable the command (ip mtu 9198) but do we need to do this under the physical interface or the VLAN interface?
Below is some snipits of the related sections of our config.
interface lag 22 multi-chassis
no shutdown
description Uplink to Juniper_Core
no routing
vlan trunk native 1
vlan trunk allowed all
lacp mode active
interface 1/1/55
no shutdown
mtu 9198
description Uplink to Juniper_Core
lag 22
interface vlan2
vsx-sync active-gateways
vrf attach vr-default
ip address 10.46.2.2/23
active-gateway ip mac 00:00:00:00:46:02
active-gateway ip 10.46.2.1
interface vlan3
vsx-sync active-gateways
vrf attach vr-default
ip address 10.46.4.2/23
active-gateway ip mac 00:00:00:00:46:04
active-gateway ip 10.46.4.1
Thanks,
Nathan