On Wed, Aug 8, 2012 at 10:02 PM, John Neiberger <[email protected]> wrote: > On Wed, Aug 8, 2012 at 8:41 AM, Emanuel Popa <[email protected]> wrote: >> On Wed, Aug 8, 2012 at 5:14 PM, John Neiberger <[email protected]> wrote: >>> On Wed, Aug 8, 2012 at 5:30 AM, Emanuel Popa <[email protected]> wrote: >>>> After opening a SR for the issue below, Cisco TAC called to tell us >>>> that SRE defaults to ingress replication without giving us any solid >>>> reason for it. Also the TAC engineer clearly stated that we will see >>>> no big difference between ingress and egress replication mode. He also >>>> advised that if we really want to switch to egress replication it >>>> would be better to do it inside a maintenance window. All of this on >>>> the phone and nothing appears within the Service Request tool. >>> >>> What linecards do you have? If you're doing multicast, the linecard >>> type is important. In many cases there can be a HUGE difference >>> between ingress and egress replication mode. >>> >>> John >> >> Usually: >> - WS-SUP720-3BXL or RSP720-3CXL-GE >> - WS-X6704-10GE + WS-F6700-DFC3CXL/WS-F6700-DFC3BXL >> - WS-X6724-SFP + WS-F6700-DFC3CXL/WS-F6700-DFC3BXL >> >> Manu > > If you have a significant amount of multicast traffic, the presence of > the 6704 and 6724 will certainly increase the potential for > replication problems in ingress mode. On those modules, the inbound > Janus ASIC is responsible for all replications in ingress mode but > that responsibility is somewhat distributed in egress mode. This is > especially true if you have any etherchannels or SPAN ports > configured. However, as others have said, some features don't work in > egress mode, so it all depends on what you need your system to do.
Guys, here is the effect on the fabric of a WS-X6704-10GE linecard with DFC after switching from ingress to egress replication mode: http://bit.ly/ingress We weren't expecting such a huge impact. Ingress fabric channel utilization dropped from 40% to 25% instantly on one 20GE fabric channel of the WS-X6704-10GE linecard. Manu _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
