To all,
I am trying to extend a layer2 connection over Layer 3 so I can have redundant Layer connectivity between my HQ and colo site. The reason I need this is so I can give the "appeareance" that there is one gateway and that both data centers can share the same Layer3 subnet (which I am announcing via BGP to 2 different vendors).
I have 2 ASR's. Will EoMPLS work or is there another option?
Philip
l2tpv3
Regards,
Jeff
hello philip,
for ethernet over mpls you can use gre tunnel and run mpls over that
tunnel or you can go directly for l2tpv3 which give you the ability to
run l2vpn over l3 ip routing with no need for mpls.
BR,
Mohamed Abosree
ASR supports OTV if you can do multicast over L3. Although, you may not need L2 extensions in the end.
Hey Philip,
Any Transport over MPLS will do this too. Here's a link to an example
setup of two sites where just L3 connectivity exists between them:
https://w.ntwk.cc/working-on-atompls/. In that setup, I have just
IPSEC VPN connecting the two locations, but have an 802.1q trunk
extended between both. In the example configs, Fa0/1 on both ends is
a transparent L2 connection. The boxes used here were 3725s on 12.4T.
David.
There are lots of options but beware of the MTU.
Depending on your specific requirements, if you simply want to be able
to address hosts out of the same subnet and don't need actual layer 2
connectivity you might also want to consider proxy ARP(+NDP). This
trades some issues for others, for example you don't need to worry
about MTU issues, but it won't forward broadcast packets (this could
be either an advantage or disadvantage) or non-IP packets, it also
requires you to configure the routers so they know which addresses are
at the other site. Lots of disadvantages but there are situations
where it might be an option.
- Mike
+1 on the l2tpv3 but watch out for your mtu's
Carlos Alcantar
Race Communications / Race Team Member
1325 Howard Ave. #604, Burlingame, CA. 94010
Phone: +1 415 376 3314 / carlos(@)race.com / http://www.race.com
Mikrotik supports a proprietary format called an EOIP (ethernet over IP)
tunnel.
Justin
If the psuedowire is setup to allow a vlan to be exteneded, but the vlan is already extended over a dedicated link, how will spanning tree behave? Right now I have it setup and I dont see the psuedowire trunk in a blocking state. Will the switch that has both the pseudowire trunk on it and the dedicated link know how to forward the frames if either goes away?
If the psuedowire is setup to allow a vlan to be exteneded, but the vlan is already extended over a dedicated link, how will spanning tree behave? Right now I have it setup and I dont see the psuedowire trunk in a blocking state. Will the switch that has both the pseudowire trunk on it and the dedicated link know how to forward the frames if either goes away?
Philip,
Here is the best reference I know of to address your issue.