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.

New Member

4500-E switching speed

A classic 4500 gives 6gb per slot, a 4500-E can give 24gb per slot with E line cards.

I know in a classic 4500 all switching was central so it was a max of 6gb per slot even with local forwarding between ports on the same line card. Can a 4500-E do local forwarding with E line cards (as like a 6500 can do) or are they still limited to 24gb max even between local ports? Many thanks.

1 ACCEPTED SOLUTION

Accepted Solutions
Hall of Fame Super Blue

Re: 4500-E switching speed

Billy

The 4500-E still uses centralized forwarding, it's just improved over the 4500. The line cards cannot do local switching in the way a 6500 line card with DFC can.

Jon

2 REPLIES
Hall of Fame Super Blue

Re: 4500-E switching speed

Billy

The 4500-E still uses centralized forwarding, it's just improved over the 4500. The line cards cannot do local switching in the way a 6500 line card with DFC can.

Jon

Super Bronze

Re: 4500-E switching speed

Besides what Jon notes, it's not clear the 6500 distributed forwarding is really better vs. 4500's central forwarding, except for total capacity.

The 4500-E provides 6 or 24 Gbps per slot using a fabric, but the 6500's slot bandwidth varies based on sup, (opt., and out-of-date) fabric cards, and line cards (classic, 1 or 2 channel fabric, 8 or 20 Gbps channel bandwidth). Also, I believe many of the 4500 sups guarantee wire speed, but a 6500 sup alone always can't for the chassis and even DFCs (max 48 Mpps?) don't for all cards.

178
Views
0
Helpful
2
Replies