VPLS VLAN Modes
- default VLAN mode
- VLAN-Aware mode
- VLAN-Normalizing mode
- No-VLAN mode
VPLS, VLANs and Broadcast Domains
Default Mode
In default VLAN mode, if BUM traffic is sent, flooding happens, across all VLANs , also towards remote PEs.
By default, a VPLS does not care/know about VLAN tags
show vpls mac-table instance <name>output shows VLAN : NA
Default VLAN mode floods all traffic out all interfaces, with sender’s VLAN tag intact.
VLAN-Aware Mode
set routing-instances <name> vlan-id all
Now, Each bridge domain is aware of the VLAN associated For example, with two VLANs, two bridge domains
VLAN : 100 and VLAN : 200
BUM traffic will be restricted to the VLAN only;
VLAN-Normalizing Mode
Normalize VLANs in and out
set routing-instances <name> vlan-id X
all traffic is normalized to this single VLAN.
There is one single bridge domain VLAN : X
No-VLAN Mode
It is same as VLAN-normalizing mode, except that the VLAN is removed
set routing-instances <name> vlan-id none
VLAN is popped on input, pushed on output.
VPLS MAC table shows a single bridge domain, with VLAN : none
Dual-stacked VLAN Tags
C-Tag inner tag (customer)
S-Tag outer tag (Service provider)
vlan-tags outer X inner Y under interfaces
Dual-stacked VLANs in VPLS - behaviour in each of the VLAN modes
