Also, I forgot to mention that we have a lot of high-rate multicast flows. Quite a few of them. Do you have an recommendations on how to determine if we're running into scale limits for this hardware?
Thanks! On Thu, Jul 29, 2010 at 9:00 AM, Benjamin Lovell <belov...@cisco.com> wrote: > John, > > Is your 6748 a DFC line card? If so you are correct, moving from port 24 to > 25 would have moved you to the other Janus ASIC. Janus is the fabric/mcast > replication ASIC. > > If your problem is ONLY with mcast then you can safely ignore the Rohini. We > have addressed a number of issues with mcast replication on the Janus in > recent years. So if you are running older 12.2(18)SXF or even earlier SX code > you may want to consider an IOS update. Also not knowing your network I can't > say but it's not impossible to hit the scale limits with high rates mcast pps > and mroute counts. > > The newer LCs with the 3CXL use a newer replication ASIC that preforms > significantly better than the Janus. > > > -Ben > > > On Jul 28, 2010, at 6:04 PM, John Neiberger wrote: > >> We have a weird problem on some 7606s with WS-6748-SFP blades. We have >> a whole bunch of multicast streams running through these routers and >> there are multicast receivers directly attached. We had a problem >> where one particular multicast stream would occasionally have dropped >> packets resulting in MPEG CC errors on the receiver. We were able to >> prove that the source was clean, as were the paths between the source >> and the receiver. The receiver was not seeing MPEG CC errors on any >> other stream, which is really odd. >> >> Here's where it gets even stranger. When we moved the receiver to >> another port, like from 23 to 24, the receiver still saw the errors. >> We moved it to port 25 and the errors apparently went away. Our only >> guess is that this could potentially be an issue with the ASICs on the >> blade. Ports 13-24 are controlled by one ASIC (I believe a Rohini >> ASIC), and the four Rohini ASICs connect to two Janus ASICs. That is >> as I understand it. I may be wrong. When we moved the receiver from >> port 24 to 25, we moved to a different Rohini ASIC and possibly to >> another Janus ASIC. Regardless, according to our video guys the >> problem cleared up after the move. >> >> Have any of you ever experienced anything like this? Could this really >> be a problem on the Rohini or Janus ASICs? What sort of problem would >> only affect certain multicast groups and not others? >> >> Thanks >> _______________________________________________ >> cisco-nsp mailing list cisco-...@puck.nether.net >> https://puck.nether.net/mailman/listinfo/cisco-nsp >> archive at http://puck.nether.net/pipermail/cisco-nsp/ > > _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
