Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

Cisco Employee

Portfast usage

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

3 REPLIES
VIP Purple

Re: Portfast usage

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

Cisco Employee

Re: Portfast usage

Thanks Georg,

So what about Firewall?

Let me know.

Matteo

New Member

Re: Portfast usage

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.

115
Views
0
Helpful
3
Replies
CreatePlease to create content