IP CEF and LSR

I have heard of terms used in Network such as IP CEF and LSR.
The only place where I believe those terms are used is in MPL Wan.
I wonder if these terms (Technology) is used inside the LAN ?

Thanks
jskfanAsked:
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NetExpert Network Solutions Pte LtdTechnical SpecialistCommented:
IP CEF can be used in LAN and most of the peoples are using nowadays in DC and LAN infrastructure.

http://routing-bits.com/2009/06/02/understanding-cef/

Thanks
Kanti PrasadCommented:
Hi jskfan

Yes it uses in LAN

Cisco Express Forwarding operation has two modes one is CEF and the other DCEF.
 
CEF (Cisco Express Forwarding) is a Layer 3 switching technology. It is otherwise also referred as central Cisco Express Forwarding mode.It enables a Route Processor to perform express forwarding.


DCEF (Distributed Cisco Express Forwarding) uses line cards (such as Versatile Interface Processor (VIP) line cards) to maintain identical copies of the forwarding information base (FIB) and adjacency tables. The line cards perform the express forwarding between port adapters and thus relieves the Route Switch Processor of involvement in the switching operation.

Route Processor is a combination of RIB + FIB + AT

AT (Adjacent Table) Stores forwarding information (outbound interface and MAC header rewrite) for adjacent nodes.

FIB (FIB --forwarding information base) is lookup table to make destination-based switching decisions
RIB (Routing Information Base \ routing table) is a routes repository od Layer 3 reachability information and destination IP addresses or prefixes.

LSR (label switch router) is a Layer 3 router that forwards a packet based on the value of a label encapsulated in the packet.
jskfanAuthor Commented:
Is it used like in L3 Switches ?
to do the routing between Vlans or it is used also in L2 Switches ?
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Kanti PrasadCommented:
Hi

They are L switches.

L3 switching is hardware-assisted routing in ASICs (VIPs, RPs, TCAMs etc...) using the help of CEF (layer 3 switch)

L3 routing makes routing decisions using the universal/main CPU of the router populating the routing table and forwarding the packets in software.


For intra-VLAN communication, it uses the MAC address table. For extra-VLAN communication, it uses the IP routing table.

A L3 switch does switching and has an identity from the L3 layer which means it can have IP addresses and also do routing.

A L2 switch does switching only using MAC addresses to switch the packets from a port to the destination port  by maintaining a MAC address table so that it can remember which ports have which MAC address associated.
jskfanAuthor Commented:
If I understand you do not configure it on Switches or on routers.?
The only place I saw it configured is on Cisco MPLS, which relies CEF to build FIB,LIB,FLIB
Kanti PrasadCommented:
Hi

Yes your are correct. Please look at the below link to get some idea on the configuration

http://www.cisco.com/c/en/us/td/docs/ios/mpls/configuration/guide/12_2sr/mp_12_2sr_book/mp_static_labels.html

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jskfanAuthor Commented:
Thanks..I will get back on this later
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