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I have a fairly flat ISP network that I am upgrading to use MPLS (dont ask why, that decision is above my position) but clients/CPE are authenticated using PPPoE. Each POP uses a router configured as an LAC with a L2TP-tunnel to a LNS stack. Client information is stored in a Radius server.

I have these requirements: 1)Must use PPPoE to authenticate clients/CPE 2)avoid adding more traffic to the network as much as possible 3)Maintain IS-IS as the IGP (if IS-IS needs to go, provide valid reasons that I can use) 4)try not to use additional vendors equipment, Currently Cisco is the default with some Linksys (Cisco) equipment.

What I am planning is to just use an AToM tunnel to the LNS stack and adding MPLS to each router.

Any other ideas?

Random-IT
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  • People use IS-IS? – cutrightjm Mar 13 '15 at 05:08
  • Yes we do, and prefer it to OSPF (each person perfers a different routing protocol). IS-IS is much simpler IMO to OSPF due to no mucking about with areas if not needed and it is a more mature (is what the big guys use so gets updated more quickly) protocol. Not saying OSPF shouldnt be used, just that we dont. Most dont use IS-IS due to the issue of net names eg 49.0001.0100.0102.0001.01 once you understand that the first two sets are the network, then nest 3 are the router ID (loopback ip) and the last is not used if not needed then its just as quick to config as OSPF. – Random-IT Mar 13 '15 at 19:23
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    That aside, you can run one, two or all routing protocols at the same time if you wish/need. just setup the proper leaks so that there is no trouble with a peer only speaking one protocol trying to send to another peer that only speaks another. – Random-IT Mar 13 '15 at 19:27
  • When you say MPLS, you mean a L3 connection through another provider, a CsC config, or something else? Also don't lose track of the MTU considerations of tunneling any traffic. – cpt_fink Mar 17 '15 at 05:12
  • no other provider,all our own network. just making the l2 flat network less flat. each pop has a switch and a router that acts as an LAC. The net goal is to offer enhanced services (bridging of client networks over ours, point to point and multi-point) and reduce the network overhead of multiple route look-ups. – Random-IT Mar 19 '15 at 15:57

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