[j-nsp] EX_4500 Dot1q-LAG and MSTP Query !

[vaibhava varma]

Dear all

In the Juniper EX-4500 series switch if we are using a LAG say ae1 and
want to run dot1q peering on it with MX-240 upstreams is it necessary
to create the L2 VLAN also in the Switch e.g

set interfaces ae1 vlan-tagging
set interfaces ae1 description Interconnection-to-bbsw01-ae1
set interfaces ae1.3042 vlan-id 3042
set interfaces ae1.3042 description Interconnect_Control_bbsw01
set interfaces ae1.3042 family inet address 172.16.0.34/30

Does the VLAN 3042 needs to be added separately in the VLAN Database.
My understanding was that is not needed .

ALso regarding the MSTP configuration is it mandatory to create all
the L2 VLANs in the VLAN Database for which we creating
instance-to-vlan mapping.

In a bigger network with lots of switches why do we need to create
those L2 VLANS on a Switch for which its not catering any traffic.

Please help to confirm the same.

-- 
Regards
Vaibhava Varma