[c-nsp] ASR9K 0 packet loss

Phil Bedard philxor at gmail.com
Mon Feb 4 09:59:26 EST 2013

Of course, you can't oversubscribe the RSPs.  The RSP440 is slightly
oversubscribed if you are using the 24x10GE Typhoon cards.


On 2/4/13 9:46 AM, "Kordogiannis Themistoklis" <tkor at hol.net> wrote:

>With 1st Generation RSPs (haven't checked RSP440 yet), one existing
>scenario where you would indeed have
>packet loss in such a "failure" is with oversubscribed cards
>(A9K-16T/8-B, 8 NPs, 2 10G ports / NP)
>where in order to achieve 120Gbps you NEED Both RSPs. If you remove one
>RSP then max achievable b/w
>per slot is (if I remember correctly) ~92Gbps, so not only instant packet
>loss but continuous until
>either you replace the card or drop traffic rate.
>For some reason (space/cost ?) in order to be Line Rate you need dual RSP!
>> -----Original Message-----
>> From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
>> bounces at puck.nether.net] On Behalf Of Phil Bedard
>> Sent: Monday, February 04, 2013 4:18 PM
>> To: William Jackson; cisco-nsp at puck.nether.net
>> Subject: Re: [c-nsp] ASR9K 0 packet loss
>> I've done a bit of testing and it's actually pretty good and I have
>> seen
>> zero packet loss, and never greater than 10ms for general IP/MPLS
>> traffic.
>>  It's a gross simplification but the RSPs work the way the ALU SR
>> routers
>> have for years where the fabrics are active/active always receiving
>> traffic and there is stateful synchronization between RPs for routing
>> protocols.  Back when I did the testing the only issue they had was
>> with
>> Phil
>> On 2/4/13 6:40 AM, "William Jackson" <william.jackson at gibtele.com>
>> wrote:
>> >Hi all
>> >
>> >I have seen mentioned on marketing that you can pull out the RP from
>> an
>> >in production ASR9K and suffer no packet loss.
>> >Is this the active RP?  Can somebody shed some light on this feature
>> >please?
>> >
>> >Anyone tested this?
>> >
>> >Thank you
>> >
>> >
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