[c-nsp] WS-6500-SFM insertion into production box, much of an impact?

[Ben Steele]

For those interested I put the SFM's in last night without a hitch, in
fact it didn't even drop a packet(1s ping intervals) it just did the usual
OIR Bus pause and one packet went up to 1600ms then everything went back to
normal except packets were now using the new crossbar fabric(no reboot
required), very smooth.
Running 12.2(18)SXF4

Before:

router#sh fab swi
Global switching mode is Flow through
dCEF mode is not enforced for system to operate
Fabric module is not  required for system to operate
Modules are allowed to operate in bus mode
Truncated mode is not allowed unless threshold is met
Threshold for truncated mode operation is 2 SFM-capable cards

Module Slot     Switching Mode
    1                      Bus
    3                      Bus
    5                      Bus

After:

router#sh fab swi
Global switching mode is Compact
dCEF mode is not enforced for system to operate
Fabric module is not  required for system to operate
Modules are allowed to operate in bus mode
Truncated mode is not allowed unless threshold is met
Threshold for truncated mode operation is 2 SFM-capable cards

Module Slot     Switching Mode
    1                     dCEF
    3                 Crossbar
    5                 Crossbar
    6            No Interfaces

router#sh fab util

 slot    channel  Ingress %   Egress %

    1          0          0          0

    3          0          5          1

    5          0          1          5


Ben

On Mon, Feb 9, 2009 at 8:02 PM, Ben Steele <illcritikz at gmail.com> wrote:

> Thanks for all the replies, personally i'm thinking it will be a few second
> hiccup like you often get with OIR then on its way again but the fact i'm
> changing how the underlying switch fabric works with this makes it more
> interesting... i've scheduled an outage for this Sunday evening so I will
> let you all know how it goes.
> Cheers
>
> Ben
>
>
> On Mon, Feb 9, 2009 at 7:37 PM, Peter Rathlev <peter at rathlev.dk> wrote:
>
>> On Mon, 2009-02-09 at 10:26 +1030, Ben Steele wrote:
>> > I'm looking for some info on the insertion of a SFM into a live
>> 6500(Sup2
>> > obviously), can't seem to find any info on Cisco as to the consequences
>> this
>> > may have to traffic flowing through the Bus at the time(ie dropped
>> packet
>> > rates),
>>
>> Just to chime in with more non-certain knowlegde: When doing OIR the box
>> does a "bus stall" AFAIK. This happens between when the pins start
>> connecting and when all pins are connected.
>>
>> If this were to not cause any lost packets, the modules would have to
>> buffer while the bus stall is in effect and retransmit whatever was on
>> the wire when it happened. I don't think they do.
>>
>> Regards,
>> Peter
>>
>>
>