I've got Routers F, G, and H on a token-ring segment (10.4.4.0/24), over which they all participate in IS-IS. Router G also has a serial link to Router D over 188.8.131.52/252.
Each router has a NET of
Where x is the number of the router's letter (D=4; F=6; G=7; H=8). Also this is true of the token-ring interface addresses (F's tok0 is 10.4.4.6, etc...)
Router H's IP table looks like this:
Gateway of last resort is not set
184.108.40.206/32 is subnetted, 1 subnets
O 220.127.116.11 [110/7] via 10.4.4.6, 00:00:13, TokenRing0
18.104.22.168/24 is variably subnetted, 3 subnets, 2 masks
i L2 22.214.171.124/32 [115/20] via 10.4.4.7, TokenRing0
i L2 126.96.36.199/32 [115/30] via 10.4.4.7, TokenRing0
O 188.8.131.52/30 [110/70] via 10.4.4.7, 00:00:13, TokenRing0
10.0.0.0/24 is subnetted, 1 subnets
C 10.4.4.0 is directly connected, TokenRing0
C 184.108.40.206/24 is directly connected, Loopback0
Yes there's also OSPF in there routing some of these networks but there's no redistribution configured, and since every NET begins with 49.0001, the same area ID, why would these be seen as L2 routes?