What is CLNS ? The answer is "Connectionless Network Service" It's different from IP. This is one of the issue for Juniper router. Because Juniper router doesn't support CLNS routing in M/T and static route support in J series. And In cisco IOS router you can run DUAL ISIS at the saem time.
Take a look. From JNCIP book :
"Juniper Networks M-series routers support the IS-IS protocol strictly for use in building IP routing tables. There is no support for the routing of OSI Connectionless Network Service (CLNS) network layer packets."
http://www.juniper.net/techpubs/software/jseries/junos93/jseries-config-guide-advanced/configuring-is-is-for-clns.html
This help you Configuring IS-IS for CLNS.
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Senior Engineer in Asia, work with IOS and Junos. Double CCIE in RS, SP.and Juniper JNCIP.
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