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fib 's entries for a prefix

sarahr202
Level 5
Level 5

Hi everybody!

My cisco book shows an out put:

switch# show ip cef

prefix next hop interface

0.0.0.0/32 receive

192.168.199.0/24 attached vlan1

192.168.199.0/32 receive

192.168.199.1/32 receive

192.168.199.2/32 192.168.199.2 vlan1

192.168.199.255 receive.

My question is if we had physical interface say f0/1 not vlan 1, would we get the same entries in fib?

thanks a lot!

2 Accepted Solutions

Accepted Solutions

Harold Ritter
Cisco Employee
Cisco Employee

Sarah,

It would indeed be the same. It doesn't matter to CEF whether the interface is physical or logical.

Regards

Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México

View solution in original post

Jon Marshall
Hall of Fame
Hall of Fame

0.0.0.0/32 receive

192.168.199.0/32 receive

192.168.199.1/32 receive

192.168.199.255 receive

The above 4 would be the same.

192.168.199.0/24 attached vlan1

192.168.199.2/32 192.168.199.2 vlan1

The above 2 would refer to a physical interface, f0/1 in your example.

Jon

View solution in original post

2 Replies 2

Harold Ritter
Cisco Employee
Cisco Employee

Sarah,

It would indeed be the same. It doesn't matter to CEF whether the interface is physical or logical.

Regards

Harold Ritter
Sr Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México

Jon Marshall
Hall of Fame
Hall of Fame

0.0.0.0/32 receive

192.168.199.0/32 receive

192.168.199.1/32 receive

192.168.199.255 receive

The above 4 would be the same.

192.168.199.0/24 attached vlan1

192.168.199.2/32 192.168.199.2 vlan1

The above 2 would refer to a physical interface, f0/1 in your example.

Jon

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