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. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

SUP720-3BXL Collapsed Core with BGP

We currently run (2) 7206-VXR w/NPE-G1 as our edge routers and (2) Catalyst 3750G's as our core L3 switches.  Our entire network only pushes 50-100 Mbps at the moment.  We want to go with a 100% hardware based platform for IPv4 and IPv6 and give ourselves plenty of growth room, while not overspending on capacity.  We will soon double our bandwidth utilization to 200-300 Mbps.  Our upstreams consist of (2) 1 Gbps Ethernet hand-offs and we're currently taking full BGP routes.  This could expand to (4) 1 Gbps uplinks in the future as needs dictate.

I'm concerned with 1 Gbps connections between our edge/core and have therefore been considering a collapsed core model in order to avoid this.  The Catalyst 6506's sound ideal due to being all hardware based, supporting BFD, NSF/SSO redundancy, etc.  The Sup720 is more than sufficient for us on an L2 basis.  My only concern is their BGP capability (RAM and TCAM capacity for IPv4 and IPv6). 

Questions

1) Can the SUP 720-3BXL's handle 2 full routes with IPv6 growth sufficiently and without us having to worry about running out of RAM and TCAM capacity?  I realize the 7220-3BXL's have 1GB or RAM just like our NPE-G1's.  The NPE-G1's seem to be fine with 2 full BGP tables:

border1>show mem

                Head    Total(b)     Used(b)     Free(b)   Lowest(b)  Largest(b)

Processor   67621140   865987916   493838592   372149324   370634320   312339788

      I/O    C000000    67108864     3751420    63357444    63326624    63332732

Transient   7B000000    16777216      348252    16428964    11575076    16428928

border1>show ip bgp summ

...

BGP using 146906170 total bytes of memory

What about TCAM utilizaiton here?

2) If the answer to the above is "no", can we just filter incoming BGP routes to adjacent + default in order to free up memory/TCAM?  Or, filter anything less than /24 and use default routes?  Maybe we run either of the two aforementioned for the next few years, and then upgrade to Sup 2T later, as RAM/TCAM utilization increase?

The reason I'm leaning to the above is:

1) Elimination of potential bottleneck between edge/core, while not having to spend $$ on 10G

2) Ability to upgrade to 10GB as needed

3) Ability to upgrade SUP's as needed

Like I said, by no means so I want to under purchase here.  But, if the SUP720-3BXL's can suit our current and future needs, then I'm inclined to go this route.  We know that even a 3560 can handle our L2 and L3 switching/routing capacity easily.  I don't want to have to spend another $20-40k simply to support BGP if there is a more economical and/or practical way to achieve our goals.

I could also go with (2) ASR 1002's for our edge and then stacked 3750-X's for our core, with a total of 4-8 Gbps links between them.  Getting rid of the edge <-> core links sounds appealing however.

1 ACCEPTED SOLUTION

Accepted Solutions
Hall of Fame Super Gold

SUP720-3BXL Collapsed Core with BGP

I'm with Reza.  WHY do you want to use the Sup720?  Heck, why still use 6500E chassis?

You want a collapsed core?  You're already in a prime position to use the 6880X or 6807XL.  All you need is throw in the 6800IA and you're pretty much set!

4 REPLIES
VIP Super Bronze

SUP720-3BXL Collapsed Core with BGP

If you are planning to use sup-720, you may want to consider using Sup-2T. The nice thing about Sup-2T is if 5 years down the road you want to switch chassis and buy the new 6800 series, you can simply take the Sup and the modules and put them in the 6800 chassis.  As far as the number of IPv4 routes and TCAM entries, the numbers are pretty close.

Have a look at table-10 in this link for a good comparison

http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/white_paper_c11-676346.html

Also, here is the Sup-2T data sheet:

http://www.cisco.com/en/US/prod/collateral/modules/ps2797/ps11878/data_sheet_c78-648214_ps708_Products_Data_Sheet.html

HTH

Hall of Fame Super Gold

SUP720-3BXL Collapsed Core with BGP

I'm with Reza.  WHY do you want to use the Sup720?  Heck, why still use 6500E chassis?

You want a collapsed core?  You're already in a prime position to use the 6880X or 6807XL.  All you need is throw in the 6800IA and you're pretty much set!

New Member

SUP720-3BXL Collapsed Core with BGP

The C-6880-X looks perfect.  VSS + 10G + 2M IPv4 + 1M IPv6 + 4GB RAM looks like a great solution that should last a long while.  Thanks!

VIP Super Bronze

SUP720-3BXL Collapsed Core with BGP

Just be cautious, as the 6800X is a brand new product and not many people have deployed it.

Good Luck

486
Views
0
Helpful
4
Replies