As far as I know there is not an absolute limit on the number of EBGP sessions. It is mostly a question of the resources needed for each neighbor (how many routes, etc) and the resources available on the router.
Anyway my issue is extremely practical: if I have for instance a 2851 router at headquarter site and this router has to support N x GRE tunnels to remote sites along with N x BGP neighborship, how can I determine N with a certain accuracy?
The maximum number of interfaces (physical, subinterface, or virtual) a router can handle depends on the maximum number of SWIDBs that the router can use.
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.
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
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