Hey all, Adam I believe that is correct. If I remember this, if it's something other than 0x4/0x6 Trio chip looks at bits after first 12 bytes; if it's 0x0800/0x86dd it still load balances this packet based on IPv4/IPv6 rules, and if it's 0x8100 it skips up to two vlan headers and again checks for real ethertype. If it's something other than this it stops and just load balances used MPLS tags. So if there's CW, it still check for three things above (since CW doesn't start with 0x4/0x6), and then just fails. I think...
How would router be certain of packet type based on packet length? Also since hashing is decided on ingress PFE if next-hop is aggregate/ecmp, trio only looks at first 128bytes or so. So probably looking at 0x4/0x6 is the cheapest/fastest way of guessing without performance penalty... Somebody correct me if I'm wrong BR On Thu, Oct 29, 2015 at 11:10 PM, Adam Vitkovsky <adam.vitkov...@gamma.co.uk > wrote: > > > > Saku Ytti > > Sent: Thursday, October 29, 2015 7:49 PM > > > > Now you can have MAC address > > starting with 4, which would be incorrectly balanced as if it were IPv4, > causing > > reordering. > > > But shouldn’t the box check for packet length to avoid the "4" or "6" DMAC > issue > So it should revert back to ethernet parsing when DMAC starts with 4x: or > 6x: and length does not match right? > For ethernet pw it should be able to skip upto 2 vlans and still include > its ipv4/v6 payload. > But I haven't lab this yet so it's just a theory. > > > adam > > > Adam Vitkovsky > IP Engineer > > T: 0333 006 5936 > E: adam.vitkov...@gamma.co.uk > W: www.gamma.co.uk > > This is an email from Gamma Telecom Ltd, trading as “Gamma”. The contents > of this email are confidential to the ordinary user of the email address to > which it was addressed. This email is not intended to create any legal > relationship. No one else may place any reliance upon it, or copy or > forward all or any of it in any form (unless otherwise notified). If you > receive this email in error, please accept our apologies, we would be > obliged if you would telephone our postmaster on +44 (0) 808 178 9652 or > email postmas...@gamma.co.uk > > Gamma Telecom Limited, a company incorporated in England and Wales, with > limited liability, with registered number 04340834, and whose registered > office is at 5 Fleet Place London EC4M 7RD and whose principal place of > business is at Kings House, Kings Road West, Newbury, Berkshire, RG14 5BY. > > > _______________________________________________ > juniper-nsp mailing list juniper-nsp@puck.nether.net > https://puck.nether.net/mailman/listinfo/juniper-nsp > _______________________________________________ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp
