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You're assuming that the routers will be using the T1's to talk to each other.
No, I'm not assuming that, as the OP states:
I will be installing two 2811 routers with four dedicated (point-to-point) T1 connections.
Is it better (faster) to use Multilink PPP, IP CEF, or can I use a combination of both?
On the other hand,
I am assuming he will be putting 4 T1's on each router, that each router will be internet facing, the routers will not be talking to each other, and therefore would render OSPF completley useless.
OP doesn't mention Internet, so yes, I agree, you're assuming. Also "dedicated (point-to-point T1 connections", at least to me, implies leased lines between two of the OP's routers, i.e. those routers will be talking to each other and have nothing, whatsoever, to do with Internet facing. So, OSPF might not be completely useless as you also assume.
But, even using your assumption, that we're working with Internet facing links, IP CEF works with more than OSPF. For example, you could use it with BGP or with, I believe, static routes too.
Now show me the CEF scenario.
Perhaps for Internet statics:
!router 1 (client side)
conf t
in s0/0/0
ip add 192.168.0.1 255.255.255.252
no shut
exit
in s0/1/0
ip add 192.168.1.1 255.255.255.252
no shut
exit
in s0/2/0
ip add 192.168.2.1 255.255.255.252
no shut
exit
in s0/3/0
ip add 192.168.3.1 255.255.255.252
no shut
exit
ip route 0.0.0.0 0.0.0.0 192.168.0.2
ip route 0.0.0.0 0.0.0.0 192.168.1.2
ip route 0.0.0.0 0.0.0.0 192.168.2.2
ip route 0.0.0.0 0.0.0.0 192.168.3.2
end
!router 2 (ISP side)
conf t
in s0/0/0
ip add 192.168.0.2 255.255.255.252
no shut
exit
in s0/1/0
ip add 192.168.1.2 255.255.255.252
no shut
exit
in s0/2/0
ip add 192.168.2.2 255.255.255.252
no shut
exit
in s0/3/0
ip add 192.168.3.2 255.255.255.252
no shut
exit
!where a.b.c.d is some public /24
ip route a.b.c.d 0.0.0.255 192.168.0.1
ip route a.b.c.d 0.0.0.255 192.168.1.1
ip route a.b.c.d 0.0.0.255 192.168.2.1
ip route a.b.c.d 0.0.0.255 192.168.3.1
end
