I have to configure about 5k tunnel and additional 5k loopback interfaces on 7301 and 7206VXR (NPE-G1). We are running 12.2 SB and 12.4 Mainline.
Are there any limitations regarding a max. number of tunnel and/or loopback interfaces in above versions ? The former limitation was 255 tunnel interfaces, but now I can assign numbers up 2 billion.
Rick is totally right, the limitation of the interfaces is bind to the IDB limit which is a function of the IOS and the Platform.
Each tunnel interface definition, such as Universal Transport Interface (UTI), Generic Routing Encapsulation (GRE), Multiprotocol Label Switching Traffic Engineering (MPLS TE), or Any Transport over MPLS (AToM) consumes an HWIDB plus one SWIDB per tunnel, plus an additional SWIDB for each additional sub-interface, for example, a Frame Relay PVC, that is tunneled. The tunnel IDBs are in addition to the original interface(s) that are tunneled.
Following is the output of one of our G1s running a 12.3 code.
Maximum number of Software IDBs 20050. In use 1568.
HTH, please do rate all helpful replies,