extend VLAN (i.e. same broadcast domain) using VRF-Lite
hi gurus,
is there anyway to extend VLAN (same broadcast domain over layer 3 network) using VRF-Lite ?
e.g.
Host1 —– SW1 —– R1 —— R3 —— SW2 ——- Host2
In above simple network …. If I need to have same VLAN (e.g. VLAN 100) for both Host1 and Host2 …. is it possible using VRF-Lite ? Is it depend on SW1/SW2’s L3 capability ? What are the possible ways to accomplish this ?
thankx, nahskur
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If end-to-end switching is possible, use 802.1Q tunnel, otherwise L2TPv3 tunnel between R1 and R3 (xconnect, etc..)
Adel Abouchaev, CCIE# 12037, CISSP, MCSE
Netmasterclass LLC, Cisco Learning Partner RFC821: adel@netmasterclass.net E.164: +18886772669 HTTP: http://www.netmasterclass.net
thankx for the reply …
if I do not want to maintain same broadcast domain … can i use VRF-Lite to extend (same VLAN) same IP subnet over the campus network (where campus core is L3 only) ?
href=”mailto:adel@netmasterclass.net”>adel@netmasterclass.net href=”mailto:nobody@groupstudy.com”>nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of href=”mailto:ccielab@groupstudy.com”>ccielab@groupstudy.com
If you are using routing technologies, and Host1 and Host2 are in the same subnet (network/mask) but these subnets are not on the same broadcast domain, then Host1 will not be able to contact Host2. For Host1 the destination should be on the same broadcast domain and it will not contact the default gateway as the next hop, but will keep sending ARPs.
The term “VLAN” doesn’t apply to VRF-lite, which is about how to route traffic and separate sets of interfaces into separate routing domains without using MPLS.
Cheers,
Adel Abouchaev, CCIE# 12037, CISSP, MCSE
Netmasterclass LLC, Cisco Learning Partner RFC821: adel@netmasterclass.net E.164: +18886772669 HTTP: http://www.netmasterclass.net