connect 2 x 3750X to dual-core collapsed core 6509 at layer 3 in order to reduce the MAC Table as the core reached 95% CAM Table

[Ibrahim Jamil]

Hello overseas Guys

Greeting

i got the below suggestion , but frankly confused me :(

connect 2 x 3750X to dual-core collapsed core 6509 at layer 3 in order to reduce the MAC Table as the core reached 95% CAM Table

mmmmm

what does it mean at layer 3 , does it mean the up links are L3 p2p or what ??

currently the routing happened for all SVIs + FHRP at both collapse 6509

[Seb Rupik]

Hi there,

Correct, logically you would configure a single Layer 3 link from the core. VLANs on the 3750 would be locally routed. This way the MAC addresses of devices connected to the 3750 do not appear in the core.

This implementation would be known as a routed access layer.

Keeping in mind that without additional licenses the 3750 does not support dynamic routing protocols so static routing would be required for the core, a default route would be sufficient on the access layer.

cheers,

Seb.

[Leo Laohoo]

This means the 3750X is Layer 3. Instead of the core switch keeping all the MAC address tables, this role has been "delegated" to the 3750X.

[Ibrahim Jamil]

Hi Leo

so the interface from the 3750-X to core are P2P routed link , am i right

do i need to run EIGRP also on this 3750-X???

thanks

[Leo Laohoo]

No need to run EIGRP on the 3750X. That job goes to the core switch.

[Ibrahim Jamil]

Hello leo

did you consider the below

the links from 3750-X are p2p ( L3 Interfaces) to dual-core

thanks

[Leo Laohoo]

If I remembered correctly, our core were running EIGRP and the 3750E were running OSPF. The core was re-distributing EIGRP to OSPF.

[Ibrahim Jamil]

no no

only EIGRP at Collapsed CORE

thanks