frame relay sub interfaces ?

frame relay sub interfaces ?

Hello, I wish yo could help me. I'd like to know if I can monitor frame relay sub-interfaces, if so what license pack you suggest me to buy. I have 25 remote sites interconected with Cisco 1841 Routers through serial interfaces, in my headquarter I have a Cisco 285. I was planning to buy 50 interfaces pack, those 50 interfaces are both physical and logical ??



Thanks




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