Portfast usage

[mcardell]

Hi all,

I have got a Firewall that is doing intervlan routing (no dynamic routing involved). The connectivity is with 3 different interface into a 3550 switch (Just L2). Can I enable portfast on the switch interfaces?

I am not seeing any issue with this. Are you awareof some of them?

Any help is appreciated.\

Regards.

Matteo

[Georg Pauwen]

Hello Mateo,

the general rule is that portfast should only be enabled on ports that have endstations connected, not e.g. other switches.

Regards,

Georg

[mcardell]

Thanks Georg,

So what about Firewall?

Let me know.

Matteo

[smcquerry]

Yes you can enable portfast on a connection to the firewall.

Portfast should not be enabled where you have the possibility of a layer 2 loop. Since firewalls are essentially layer 3 devices, a loop can not be formed if you enable portfast on a port connected to that device.