[j-nsp] M160/JunOS 7.6R1.10: ae0 fails to install L2 descriptor

[Josef Buchsteiner]

pb>  I have a couple of questions:
pb>  a) Is it normal to have 32k L2 Descriptors for 8.2k Next-Hop Entries?

     yes..  since  this is ethernet and the layer2 header size is
     big for ethernet and you most likely have all three links on
     one FPC. i.e 3 times more resources.

pb>  b) Is there a way to increase the number of available L2 Descriptors? (how
pb>  many L2 Descriptors does a SFM-16 support?)

     this has nothing to do with the SFM.. Enhanced FPC will have
     about 160K space... its all about memory

pb>  c) Is there a way to make the router fail with less impact to the network
pb>  (for example simply shutting down the new interface automatically instead of
pb>  refusing to update the next-hop table until the interface is taken down and
pb>  all sfms are restarted manually)

     there  would  have been never a need to restart any SFM. all
     you  would  have  need  to do is to deactivate the aggregate
     interface and enable it again without the third member link.
     You  could also maybe set the member links on different FPCs
     so  you  better  share  the space of L2 Descriptor among the
     FPCs.  If  you  have  three  member-links  you triple the L2
     resources you need.

     In  fact you know only that you run out of resource once you
     try to program it in hardware and the only way is to refuse
     it. There is no real good way to know upfront. I believe the
     RSMON  feature  is  able  to monitor such resources and will
     send  an  alarm  if  configured  once  you reached a certain
     threshold so you know that you are moving to the limits.

pb>  
pb>  Any help is appreciated.
pb>  Thanks in advance, Peter
pb>  
pb> 
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