ISIS over NBMA

Posted on April 4, 2010

When configuring ISIS over NBMA networks (such as ATM or FR) don’t forget that you probably configured static mapping such as

For ATM

interface ATM 0/0
 pvc 0/109
  protocol ip 1.1.1.1 broadcast


For FR

interface Serial 1/0
 encapsulation frame-relay
 frame-relay map ip 1.1.1.1 109 broadcast

but you know that ISIS uses CLNS as a protocol and not IP so you won’t get adjacency there.

To correct this, you need to map CLNS also

interface ATM 0/0
 pvc 0/109
  protocol clns 00 broadcast

For FR

interface Serial 1/0
 encapsulation frame-relay
 frame-relay map clns 109 broadcast

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