this gives a higher redundancy due to the ability to serve more fabric cards and higher fabric capacity per slot. Using the 9922/11 with separate fabric cards is not a story changer either, we just have pulled the fab chips off the RSP and called them FC (fabric cards) and RP's (route processors). What is drawn here in the picture is the RSP440 (serving 55G per link for typhoon). The 9922 and the 9911 have separate fabric cards. The linecard fabric stage reduces the number of fabric links. If all of these FIA's would directly connect to the RSP fabric chips, we'd run out of fabric links in the higher slot chassis such as the 9010. High density linecards such as the 24x10 have 4 FIA's and the 36x10 has 6 of them. As you can see, all FIA's connect with the fabric chips. The reason why Typhoon has a linecard fabric stage is to reduce the number of fabric links. It is a non blocking asic, but it can assist with backpressure when it receives it from the fabric. The reason why Trident has a bridge is because of the memory interfae on the NPU is XAUI whereas the FIA speaks DDR2, the bridge converts in between. Trident does not have a fabric stage on the linecard whereas typhoon does.įor forwarding this doesn't really matter in terms of troubleshooting difference.In this article we're going to get a closer look at the FIA (Fabric interface Asic) and the Fabric itself. The article deepdived into the NP and its operation and verification. The following picture gives an overview as to how packets are going from ingress to egress interface/linecard with the different forwarding asics in place. Most of the commands for fabric verification can be used due to the fact that the SIP700 has the same FIA as the Trident linecard, but in this reference we are not specifically zooming in on the SIP700. Although the sip700 interfaces with its own FIA to the RSP fabrics like any other linecard would. This document does not pertain directly to the SIP700 linecard. I realize that some commands need to be explained better or what the output really means, but hopefully this gives a good impression to get started on the fabric.įor this purpose it is important to know which type of linecard we have, a Trident or Typhoon.Ĥ0G linecards: A9K-40GE, A9K-2T20G, A9K-4T, A9K-8T/4Ī9K-24x10, A9K-36x10, A9K-MOD80/160, A9K-2x100 Note this is just the first version of the document. In this document we'll focus on the fabric specific. Previous articles have expanded on the NP counters and NP troubleshooting. In this document we are going to expand on the fabric troubleshooting and operation. Useful commands to check for any hardware errorsĪs you know troubleshooting the ASR9000 and XR is close to my heart.Visualization of the show commands and what they are checking.Step 4) Exclude all "known" related fabric issues.Step 3) Follow the steps mentioned in packet drop debugging sections.Step 2) Check if your hardware FPGA versions are up-to-date.Step 1) Look for active PFM alarms on LC as well as RSPs.
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