@sivam siva Hello,
You need consider other charactheristics about Cisco information, for exemple:
"With an incomplete adjacency, CEF considers that the router as a whole (including all the other switching paths) does not know how to get to the adjacent node. We punt packets to process switching in order to kick off some resolution protocol like Address Resolution Protocol (ARP),"
"Only packets that match a glean adjacency are punted to the Gigabit Routing Processor (GRP). In addition, on the GSR, the LC CPU does not punt packets to the GRP for features, and the LC sends an ICMP unreachable (as long as the no ip unreachables command is not configured). On the GSR, the only traffic punted to the GRP are packets destined to an interface on the router or packets sourced from the router."
Looks below;
- Host route adjacency: A host route adjacency entry is used to specify that a specific host is within one layer two hop.
- Null adjacency: This is used for packets which are destined for the Null0 interface.
- Glean adjacency: A glean adjacency is used when a device is connected to multiple hosts off the same interface. In this case, the entry contains a prefix for the subnet not just for a specific host entry.
- Punt adjacency: This is used for those packets that utilize features not currently supported by CEF and which must be forwarding to the next switching level (often to be process switched).
- Discard adjacency: A discard adjacency entry is used for those packets that are to be automatically dropped.
- Drop adjacency: A drop adjacency entry is used for those packets which dropped but only after the prefix is checked.
A punt occurs under these conditions:
The next lower level did not produce a valid path or, in the case of CEF, a valid adjacency. In other words, if the CEF lookup process failed to find a valid entry in the forwarding information base, the packet is punted to the next available switching path or dropped.
A particular feature or Layer 2 encapsulation is not supported at the lowest level. If CEF supports a particular feature, ownership of a packet is passed through a set of software routines in the CEF "feature path."
A feature requires special handling.
In other words, normall is drop the package. For your studies, you should consider the conditions.
Jaderson Pessoa
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