Terminating WAN links on Cisco 6509

[bhushit17]

Hi

We have 2 WAN links of 1Gbps each, can I terminate them on a C6509 with sup720 card in it.

I doubt it because I don't think 6509 will provide me with required throughput in my case.

Regards,

Bhushit

[Jon Marshall]

The 6500 is more than capable of handling that amount of traffic.

It does depend on the module you are connecting the links to so what is it ?

Jon

[bhushit17]

Hi Jon

We have couple of CEF720 48 port 10/100/1000mb Ethernet  "WS-X6748-GE-TX"

Can they support the bandwidth requirement, though we will only terminate 2-3 links on a slot and other 3 downlinks on another slot.

Thanks,

[Jon Marshall · Accepted solution]

Those modules support 40Gbps to the switch fabric so yes they can support that bandwidth.

In theory they are still oversubscribed because 48 x 1Gbps in from connected devices with 40Gbps to switch fabric but it is highly unlikely even if you are using all 48 ports they will all be transmitting simultaneously.

Jon

[bhushit17]

Thanks Jon

So I can use only a single module if I only have 8-9 links in total(including uplink/downlinks)

Thanks again,

Bhushit

[Jon Marshall]

Yes you can and you can use any ports on the module, no need to worry about port groups.

BGP is dependant primarily on the number of routes and amount of memory your supervisor has.

In terms of NAT it depends on how much you are doing in terms of individual flows.

It is done in hardware so you should be okay but I have seen reports in the past of the 6500 not being great for a large number of flows.

Maybe one of those things to keep an eye on.

Jon

[Joseph W. Doherty]

Disclaimer

The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.

Liability Disclaimer

In no event shall Author be liable for any damages wha2tsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.

Posting

For 8 to 9 gig ports, you're fine on a 6748.  However without knowing the rest of the hardware, cannot say whether you might overwhelm the sup.

As Jon notes, the 4748 has 40 Gbps to the fabric.  Actually 24 ports share a single 20 Gbps channel, so if you don't exceed 20 ports of 1..24 or 25..48, you won't oversubscribe the channel bandwidth.

If you have a sup720B, and all your installed cards are CEF720 cards (like the 6748), and none with DFCs, the sup provides 30 Mpps, shared across the whole chassis.  The 30 Mpps, for a fabric cards, also is independent of packet size, so you have minimum forwarding bandwidth capacity of about 20 Gbps.

[bhushit17]

Now I have got SUP-2T cards for my 6509, along with WS-X6848-TX-2T and WS-X6824-SFP-2T on slots 1 and 2 respectively.

Now I have terminated the uplink to ISP on SUP-2T SFP's, 2 ethernet links on 48 port 6848-TX.

So I think this will work fine, is it okay to terminate gig links on SUP card itself ?

Thanks

[Joseph W. Doherty]

Disclaimer

The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.

Liability Disclaimer

In no event shall Author be liable for any damages wha2tsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.

Posting

I recall the sup2t's ports are much improved over the sup720's ports, and the sup, itself, has twice the Mpps of the sup720B.  I.e., you can use them, but if you have 6800 line cards, unless you run out, there's no real need.

The sup2t also offers 40 or 80 Gbps per slot, even for all the 6513E's slots.  The 6800 cards are CEF720 cards (i.e. 40 Gbps) that support the DFC4.

[bhushit17]

Every slot is showing as 20Gbps in "Show fabric" output:

show fabric status all:
 slot  channel speed module   fabric   hotStandby  Standby  Standby
                     status   status      support  module   fabric
    1        0   20G     OK       OK       Y(hot)
    2        0   20G     OK       OK       Y(hot)
    2        1   20G     OK       OK       Y(hot)
    5        0   20G     OK       OK          N/A
    5        1   20G     OK       OK          N/A
    6        0   20G     OK       OK          N/A
    6        1   20G     OK       OK          N/A

[Joseph W. Doherty]

Disclaimer

The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.

Liability Disclaimer

In no event shall Author be liable for any damages wha2tsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.

Posting

Whether your 6509 can support your required throughput of another two gig links, depends on how busy your 6509 is now, your 6509's hardware configuration and how much, and kind of, additional traffic will be on these additional gig links.  Many variables go into the capacity of a 6509 with a sup720.

A couple of the major variables, for a 6500's overall performance capacity, include whether the chassis in running in fabric mode and whether line cards have DFCs.

[bhushit17]

Hi Joseph,

We haven't yet deployed the 6509, we are currently having ASR-1002 for this particular function, but it must go because of some other reasons(managerial decisions).

Other than 2 gig uplinks we will have 4-5 downlinks, that's all wrt connections on the huge 6509.

Regards,

[Jon Marshall]

If you are really only using that number of connections then your 6500 can certainly cope with that.

Bear in mind that although the 6500 has a lot of features it may not support all those of the ASR but if it is just pure bandwidth you are fine.

Jon

[bhushit17]

I will need nat function other than a single bgp neighbor w/o any routing table downloads.

Thats all I require.

[design1balu1]

dgfhdfgdfg