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- About vijnaana47711
08-27-2019
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06-04-2019
11
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Created by
vijnaana47711
in Switching
in Switching
08-21-2019
03:13 AM
08-21-2019
03:13 AM
Hello, I would like to know which data structure is used for maintaining timers associated with the mac address table entry aging. Any references also would help. Thank you, Vij
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08-07-2019
07:52 AM
Hi Giuseppe, Thank you for the reply. I was actually looking for some additional details. I found the picture in the attached file on the net. It shows the various blocks, but doesn't elaborate on how a route entry in MRIB gets mapped to a hardware entry in ASIC and how the replication happens. There seems to be multiple steps involved in ASIC and that's what i'm looking for. Regards, Arut
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08-07-2019
02:44 AM
Hi, I read some docs(BRKDCT-3101) on CISCO live which talks about multicast replication. Needed clarification on a few concepts: 1) There is an internal group id which is used and multiple (S,G) entries share the same group id. Does each mroute map to an internal group? N9K# bcm-shell mod 6 "ipmc table show" SRC IP ADDRESS MC IP ADDRESS MC GROUP VID VRF COS HWIDX CLASS HIT 13.13.13.14 239.10.10.10 0x2000007 0 1 0 75680 1 no 0.0.0.0 239.10.10.10 0x2000007 0 1 0 86578 2 no 2) What is a replication group? I am trying to connect the dots from control plane (mroute) to what happens inside the ASIC. How does a mroute (Source IP, Group IP, OIF list) get mapped and replicated internally ? Thank you, Vij
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Created by
vijnaana47711
in Switching
in Switching
06-20-2019
03:38 AM
06-20-2019
03:38 AM
Hi Georg, I was referring to parsing in C code. Thanks
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Created by
vijnaana47711
in Switching
in Switching
06-19-2019
07:15 PM
06-19-2019
07:15 PM
Hi Folks Since the vlan tag field is inserted between SA and type fields, how would one know whether an ethernet frame has vlan tag or not? Normally the type field comes after the SA field and we can determine the type easily, but with type field coming after the vlan tag, how does we know about the 802.1Q encapsulation? Thanks
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06-06-2019
07:38 PM
Hi Scott, One quick question. On going through the docs I got upon EOBC, but it talks of half duplex communication between Supervisor card and LC. I wonder if there's another such channel in the reverse direction for the CPU punt? Thank you
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06-06-2019
12:15 PM
Hi Scott, Can PCIe be one such interface and is DMA still being used by modern switches with a switch fabric architecture? Thank you
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06-06-2019
10:49 AM
Hi Joseph, I'm not looking for details, but just trying to get the big picture of whether DMA or some other mechanisms are used. The answer need not be wrt a Cisco platform even. Thank you
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06-06-2019
01:09 AM
Hi, I would like to know if a CISCO switch uses DMA (Direct memory access) to copy a control packet (e.g OSPF) or a packet for which there is no entry in FIB to CPU? If not how does it happen? I'm not familiar with the internal architecture/ packet path (ASIC <--->cpu), so any good reference docs on the same would be helpful too. Thank you
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Labels:
08-21-2019
Hello, I would like to know which data structure is used for maintaining
timers associated with the ...
08-07-2019
Hi Giuseppe, Thank you for the reply. I was actually looking for some
additional details.I found the...
08-07-2019
Hi, I read some docs(BRKDCT-3101) on CISCO live which talks about
multicast replication.Needed clari...
06-19-2019
Hi FolksSince the vlan tag field is inserted between SA and type fields,
how would one know whether ...
06-06-2019
Hi Scott, One quick question. On going through the docs I got upon EOBC,
but it talks of half duplex...
06-06-2019
Hi Scott, Can PCIe be one such interface and is DMA still being used by
modern switcheswith a switch...
06-06-2019
Hi Joseph,I'm not looking for details, but just trying to get the big
picture of whether DMA or some...
06-06-2019
Hi, I would like to know if a CISCO switch uses DMA (Direct memory
access) to copy a control packet ...
Public Statistics
| Date Registered | 06-04-2019 12:31 AM |
| Date Last Visited | 08-27-2019 06:58 AM |
| Total Messages Posted | 11 |
