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CIsco Express Forwarding Function

Posted on 2014-10-10
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Last Modified: 2014-10-22
In the Diagram below taken from:
http://www.informit.com/library/content.aspx?b=CCNP_Studies_Switching&seqNum=55

It shows the Control Plane and Data plane. I would like to know If both are located in ASIC, or just the Data Plane ?


I believe MPLS uses LIB and FLIB in addition to RIB and FIB. I wonder where the data is collected from to form LIB and LFIB tables. ?


** It would also be helpful If someone recommends  the steps to take  in GNS 3 to demonstrate how Cisco CEF works , with few routers...
I have the topology bellows of 3700 series routers. I enabled IP CEF and configured Interfaces , and am able to ping end to end...
How can I  make sure CEF is working properly ?

Thank you.
ce
cef
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Question by:jskfan
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Predrag Jovic earned 500 total points
ID: 40374487
Since you are using GNS3 there is no way that CEF can work since it is hardware based.

From link you gave
dCEF:
dCEF can be used in Cisco Catalyst 6500 switches and refers to the use of multiple CEF tables distributed across multiple line cards installed in the chassis. Each line card that supports dCEF has its own dedicated hardware-based L3 routing engine and CEF route cache, allowing for multiple L3 data plane operations to be performed simultaneously within a single chassis-based system.
aCEF:
aCEF is a new feature supported in conjunction with the new Supervisor 720 engine which works in a similar fashion to MLS. In MLS, line cards send the initial packet of a flow to the Supervisor engine, where the packet is switched in hardware using the master CEF table.
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Author Comment

by:jskfan
ID: 40374958
I believe CEF can be enabled in GNS3.

I guess the output below is from FIB table:

R2# sh ip cef
Prefix              Next Hop             Interface
0.0.0.0/0           drop                 Null0 (default route handler entry)
0.0.0.0/8           drop
0.0.0.0/32          receive
1.0.0.0/8           attached             Serial1/1
1.0.0.0/32          receive
1.1.1.2/32          receive
1.255.255.255/32    receive
2.0.0.0/8           attached             Serial1/2
2.0.0.0/32          receive
2.2.2.2/32          receive
2.255.255.255/32    receive
3.3.3.0/24          1.1.1.3              Serial1/1
127.0.0.0/8         drop
224.0.0.0/4         drop
224.0.0.0/24        receive
240.0.0.0/4         drop
255.255.255.255/32  receive
R2#

Open in new window


However I do not see anything in the Adjacency table. I wonder if I need to initiate any traffic in order to put some data in the Adjacency table?

R2#sh adjacency
Protocol Interface                 Address
IP       Serial1/1                 point2point(7)
IP       Serial1/2                 point2point(5)
R2#

Open in new window

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Author Closing Comment

by:jskfan
ID: 40396753
Thanks
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