I have a question about summarization in ISIS. when I enable summary-address on the L1/L2 router, it will generate a static route to null interface and the summary route will only send to other area's L1/L2 router. Is it normal? I use IOS 12.2.
Thank you for your kind reply. Would please tell me from which version IOS there is a static route to null interface in routeing table, when I use summarization in OSPF or ISIS environment. As I know before, only EIGRP can generate this kind of route automatically.