Importance of next in CEF hop address

Hello

I want to understand the meaning of the address section NEXT in FIB. If the adjancency tables are there who can point to the L2 address then why do we need to have the address of next while FIB hop?

He left because of the load balancing?

Thank you for your support.

Wajih

Wajih, Rick,

Noushad has a valid point.

The FIB itself is a structure tree, built from the network prefixes found in the routing table and contains pointers to the corresponding entries in the adjacency table. If a package arrives, its destination IP address will be matched against the prefixes in the FIB and the pointer in the corresponding entry in the FIB points directly to the adjacency table entry that contains a frame pre-built header to encapsulate packets and send it to the good neighbor. Essentially, the FIB is an index on the adjacency table, by using the network as key prefixes to find records in the adjacency table (the frame rewrite information).

Source IP address of the next game in that stretch?

Surprisingly, the IP address of the next hop is only used when the FIB table entries and contiguity are built and interconnected. On the one hand, the IP address of the next jump will be resolved in the Layer2 appropriate and this addressing information, including any other information, will be used to create a table of adjacency entry. On the other hand, networks in the routing table is "compiled" into the FIB and will be contiguity related to the entries in the table with the IP address of the section as the "foreign key" to connect the FIB and adjacency table entries.

Once these structures have been built properly and connected to each other, however, the IP address of the next hop isn't really necessary when CEF/FIB searches are performed. The principle of search in the FIB requires not the presence of a following jump IP, and once the node corresponding to the destination of a package was found in the LIE, the pointer contained in the table entry of contiguity which contains already information from mapping appropriate in Layer2 next hop IP addresses to which edge node. So, really, the jump following IPs are used to construct the adjacency table and tie the FIB entries in the adjacency table entries, but they do not serve to exploit the EFC together.

The fact that IP addresses hop next appear in the output of show ip cef , even show the detail of the adjacency, does not mean that they are really part of the FIB table or contiguity. They provide diagnostic data kept for us, administrators, to better navigate outings. However, just because a next jump IP is printed in these commands Show does not mean that the IP address is actually used when you use the FIB table or contiguity. Think of it as a control and diagnostic information that can be stored in the data of the CEF, but who plays no role in the FEC works.

My two cents...

Best regards
Peter

Tags: Cisco Network

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