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Best Eigrp practice question

dan_track
Level 1
Level 1

Hi,

Which practice is most prevalently used and ideal for setting up eigrp routing?

1. make all vlan's and interfaces passive, then allow each to be enabled and add a network statement to reflect the ip details on the vlan or interface

e.g

router eigrp 100

passive-interface default

no passive-interface vlan 25

no passive-interface gigabitethernet 1/4

network 10.55.10.0 0.0.0.3

network 10.55.25.0 0.0.0.255

no auto-summary

exit

2) Or is it better to do a passive-interface for all vlan's and interfaces and allow each interface by disabling the passive-interface and then have a network statement that has allow all e.g.

router eigrp 100

passive-interface default

no passive-interface vlan 25

no passive-interface gigabitethernet 1/4

network 10.0.0.0 0.255.255.255

no auto-summary

exit

Please can you explain the merits and disadvantages of each method?

Thanks

Dan

1 Reply 1

Edison Ortiz
Hall of Fame
Hall of Fame

Both options provide the 'passive-interface default' which is considered Best Practice while the first option provides a more granular control on the advertised subnets into EIGRP.

On the 2nd option, you are automatically advertising any local link within the 10.0.0.0/8 subnet into EIGRP.

In some networks, this can be flagged as a network security issue.

HTH,

__

Edison.

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