Re: ISSU Charter paragraph

>From: joel jaeggli >Sent: Monday, January 20, 2014 7:57 AM
>
>On 1/19/14, 7:51 PM, MORTON, ALFRED C (AL) wrote:
>> BMWG,
>>
>> As we continue to build our new charter step-by-step, here's the
>> first draft paragraph Sarah and I put together for your review:
>>
>> In Service Software Upgrade (ISSU): Develop new methods and
>> benchmarks to characterize the upgrade of network devices while
>> in-service, considering both data and control plane operations and
>> impacts. These devices are generally expected to maintain control
>> plane session integrity, including routing connections. Packet loss
>> should be measured and recovery behavior noted accordingly.
>
>Quantification of impact does seem like the key deliverable.

+1

Packet loss in the forwarding plane is the main impact. Multiple forwarding planes may be involved: IPv4, IPv6, MPLS, Ethernet (including MPLS VPNs)
Other impacts may be:
- control plane impact on neighbor. Ideally no impact, but some implementations may delegate some work on the neighbors (e.g. for BGP: Graceful Restart, Route Refresh))
- delayed rerouting (e.g. how long are routing messages delayed)
- missed control plane events (e.g. ARP, DHCP, IGMP...) especially on the subscribed side

Ideally, all impact should be identified as this may impact when and how the maintenance/ISSU will be performed.
E.g. during the day or the night (typically depending on the forwarding plane impact); the need for someone to be present/available/ready to go on the peers promises (the more control plane impacts on the peer, the more risks)... 



>> We'd like to have any comments on this proposal in the next 2 weeks.
>>
>> As a reminder, we have already reviewed the items below, and we have
>> at least one or more items to sort-out before we re-charter.
>>
>> regards, Sarah and Al
>>
>>
>> * Traffic Management: Develop the methods to characterize the
>> capacity of traffic management features in network devices, such as
>> classification, policing, shaping, and active queue management.
>> Existing terminology will be used where appropriate. Configured
>> operation will be verified as a part of the methodology. The goal is
>> a methodology to assess the maximum forwarding performance that a
>> network device can sustain without dropping or impairing packets, or
>> compromising the accuracy of multiple instances of traffic
>> management functions. This is the benchmark for comparison between
>> devices. Another goal is to devise methods that utilize flows with
>> congestion-aware transport as part of the traffic load and still
>> produce repeatable results in the isolated test environment.
>>
>> -=-=-=-=-=-=-=-=-=-
>>
>> IPv6 Neighbor Discovery-related benchmarking: Large address space in
>> IPv6 subnets presents several networking challenges, as described in
>> RFC 6583. Indexes to describe the performance of network devices,
>> such as the number of reachable devices on a sub-network, are useful
>> benchmarks to the operations community. The working group will
>> develop the necessary terminology and methodologies to measure such
>> benchmarks. _______________________________________________ bmwg
>> mailing list [email protected]
>> https://www.ietf.org/mailman/listinfo/bmwg
>>
>


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