[j-nsp] MX80 no more hash-key option in 12.2?

[Paul Vlaar]

Hi Magno,

that clarifies things a bit more for me, thank you.

However, am I right to conclude that I still need the hash-key stanza
for our 11.2 MX80s to make IPv6 source/destination hashing work for load
balancing?

As for what I am trying to do, well, that is pretty simple. We have ECMP
for a number of IPv4 /32 and IPv6 /128 addresses setup via BGP within
our own network, to 32 servers. We want to have load balancing across
these servers for these addresses, and the hashing algorithm should
cause UDP to be distributed per packet, but TCP to be distributed
according to a src_ip:src_port:dst_ip:dst_port hash.

Thank you,

	~paul

On 23/10/12 5:12 PM, magno wrote:
> Hi Paul!
> 
>  Leaving the hash-key stanza enabled for MX80 leaves room to unexpected
> behaviours as you could observe yourself.
> 
>  the only supported way to tweak load balancing input paramters for TRIO
> based devices (I mean MPCs and MX80 for instance) is to use the
> enhanced-hash-key stanza.
> 
>  The culprit for the new 12.2 behavior is me, I asked for this
> modification in the code. The reasons why I asked are:
> 
> 1) hash-key is not the right config stanza for TRIO as per design, so
> the enhanced-hash-key stanza was created;
> 2) Our docs is not, let me say, so precise ... to say it in a fair way;
> 3) the hash-key, on MX80, produced unpredictable results as some
> commands led to wrong configurations on the TRIO chipset (for instance,
> I tried personally with a 10.4 release to configure source/destination
> ports which are on by default and I found in the PFE this command
> activated the input interface);
> 
> Please take into consideration that the engineers that designed TRIO LB
> decided to simplify the LB options traditionally available on other
> chipsets, so you may find missing ones under the enhanced-hash-key. TRIO
> LB algorithm is already pretty much sophisticated by default.
> 
> Of course, if you explain what you want to do, maybe we may find the
> best way to satisfy your needs.
> 
> Hope this  helps tp clarify the subject a little bit more.
> 
> Massimo.