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unwired9
Premium
join:2008-04-08
Algoma, WI
reply to Inssomniak

Re: [Tech Ops] MPLS

Is there an advantage to centrally locating your ppp termination - I was planning on terminating at each pop.



Inssomniak
The Glitch
Premium
join:2005-04-06
Cayuga, ON
kudos:2

said by unwired9:

Is there an advantage to centrally locating your ppp termination - I was planning on terminating at each pop.

I used to do that, hated it.
Wasted IP space, had to constantly reconfigure to add IP addresses (no big deal if you are using private space I guess). Radius config was a pain.

It was just a central place to manage stuff, keep all the hard work on a core (powerful) router.
--
OptionsDSL Wireless Internet
»www.optionsdsl.ca

unwired9
Premium
join:2008-04-08
Algoma, WI

Ok - IP Space is my reasoning for changing to pppoe - I can centrally manage the ip pool while keeping NAS server closer to the customers. I guess more specifically is there an advantage to running mpls vs routing public ip's with ospf. To implement I would have to replace all of the routers on my network. Just trying to figure out if its justified and if I would see an improvement over straight ospf routing or would it be a lot of work for little gain.



Inssomniak
The Glitch
Premium
join:2005-04-06
Cayuga, ON
kudos:2

Well unless you want to run VPLS VPN tunnels I wouldn't be switching.
Ospf won't degrade packet forwarding performance. It's just a route distribution protocol.

You don't really switch necessarily. I still use ospf alongside with mpls. You still need to have routes. MPLS works over current routing table wether its static or OSPF or BGP or whatever.
--
OptionsDSL Wireless Internet
»www.optionsdsl.ca


spectrumhead

join:2009-05-03
reply to Inssomniak

If you were running OSPF, why you were wasting IP space ?

It doesnt make any sense.



Inssomniak
The Glitch
Premium
join:2005-04-06
Cayuga, ON
kudos:2

said by spectrumhead:

If you were running OSPF, why you were wasting IP space ?

It doesnt make any sense.

I dont really remember if I was, I think the problem I was having is if 13 PPPoE concentrators were hitting the radius server at the same time (say after a large power blackout), the radius server would inadvertently assign the same IP address to 2-3 different customers. At least with it all on one concentrator it would reject the duplicate IP and try again, although I have not seen that in a long time (perhaps my radius/database server was too slow at the time).

Another reason I went with central concentrator was the ease of adding in other access sites, it was simple to just add an IP, turn on OSPF, MPLS, LDP and assign a VPLS tunnel ID, and bridge in my APs. Keeps CPU usage low, and configs simple..
--
OptionsDSL Wireless Internet
»www.optionsdsl.ca

spectrumhead

join:2009-05-03

Yes as I am currently thinking about doing the same, centralizing the PPPoE server with MPLS, but all this MPLS and VPLS stuff seems so complicated to me.