PE-CE Connectivity: Integrated IS-IS
Now that the enhancements to the OSPF protocol have been covered, it is time to introduce the first new protocol to be added to the list of PE-CE protocols: IS-IS. Although IS-IS is not expected to be one of the more widely deployed protocols for this type of connectivity due to its limited deployment within Enterprise networks, its availability as a PE-CE protocol might still be important in certain scenarios. For example, a VPN client might be running IS-IS on the internal network and might want to maintain the IS-IS topology when moving to an MPLS VPN environment. The primary reasons for this are similar to those discussed within the OSPF section:
Avoidance of having to redistribute IS-IS information into ...
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