Hi, Thank you for your answer mark. I have read the CLI guide while waiting for an answer and it appears that you choose the speed manually, either 5G or 10G. I guess I had my mind confused by hybrid stack and all. For the last question, you got it right, I was talking about that and you have answered the question. If someone else want to add something, please do. Thank you. Best Regards,
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Hi, I'd like to setup a small vmware infrastructure and I have some doubt about the networking part. The idea is to use a stack of Cisco SG500X-24P to connect the servers and some backup storage through ISCSI. The topology is attached, It will much more clear for you to understand what I want to setup. My questions : - What cable do I need for the Stack ? Cisco SFP-H10GB-CU1M cable seems to be enough, do I need a sfp module with this cable ? - At which speed the ports will synchronize ? 5G ou 10G ? - Is there a risk of creating a loop with this design ? I think that one stacking port will be in standby, but what happen for the rest ? - Stacking those two switchs will result of one virtual unit right ? - Does the trafic passing through the stack has the same behaviour as it if it was a uplink port ? There no trunk notion here right ? Thanks a lot guys for your help. Best Regards,
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Hello Guys, There is some few things that I don't understand about SRR, I hope you can help. 1) About Buffers weight and Queue weight : (exemple with AutoQoS default configuration) IN : queue 1 : Queue Weight = 70 % | Buffer Weight = 90 % queue 2 : Queue Weight = 30 % | Buffer Weight = 10 % I can't find out what are the consequence of those Weights, if someone can help ? Is there a best practice rules ? 2) Output Thresholds There is four Thresholds on output queue : 2 drop thresholds 1 reserved threshold 1 maximum threshold What are the purpose of reserved threshold and maximum threshold ? Is there a best practice rules to respect or it's dependent of the percentage of each trafic we wan't to prioritize ? Thanks guys, Regards, Jonathan.
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Hi, If I understood your first post correctly, there is 2 DHCP server (your two routers). What address are they offering ? Why you don't configure the DHCP on 3560 and turn off DHCP on your routeurs ? (at least to test if it's work). You can check "ip helper-address", to activate DHCP relay between different subnet or network. Regards,
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Hello Guys, It seems that Write Command on Nexus Switchs is not available anymore, can you confirm ? Is there a way to reactivate it or is there an another short command to save the running configuration on Nexus Switchs ? Thanks, Regards, Jonathan.
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Hello Guys, I use Kron with an archive to backup the configuration of my switchs. Can I do multiple archive with a Cisco 2960 ? I managed to do one : 2960(config)# archive 2960(config-archive)# path t ftp://192.168.1.1/$h 2960(config-archive)# write-memory But I wan't to do an another archive with differents parameters. It is possible ? Regards, Jonathan
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Thanks guys, A little update : Tools for stats : ntop => a great tool but not enough details for my use. Tools for traffic : iperf => easy to use For netflow, as I use cisco 2960, it's not possible, unless if a tool capable of doing the same thing exist. Do you know some ? lol (actually I found some tool on the net, fprobe who generate netflow frame and nfdump who collect and analyse the frame. But the results I have are not the results that I expected, if you have some infos on this tool)
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Hi Guys, I'm searching for some tools to help me analyse QoS. 1) A tool that generate trafic with specifics options like a voice trafic ? 2) A tool to do some statistics. PC-A -------- Switch1 ---------- Switch2 ---------- PC-B Three differents traffics are injected in switch1 and goes out on switch2. Is there a tool that give statistics on the percentage of a traffic that reached out the exit compared to other traffics ? Thanks. Regards.
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Hi, Can someone explain to me the difference between Split mac and Local Mac architecture. And of course if you have some documentation on it, I'll take with pleasure. Thank you. Jonathan.
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Hi, I'm starting to understand the whole thing now. Just one last quick question, what is the best to use, dscp or cos label ? Or it doesn't matter because of the cos-to-dscp map ? And can we have trafic shaping and trafic sharing at the same time ? About the rating thing, It's all right if I rate all the answers ? They were very useful and I think it can answer to someone else question too. I will continue to read stuff about this topic, it's very interesting. A big thank you to both of you Shashank and Sweta. Regards, Jonathan.
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I warn you, you are going to think that I'm a pain in the ass lol In a more general way, once I have done all my QoS configuration, how do I apply it ? It's just some exemple to help me understand the whole picture, I don't ask you to do the all configuration lol First case, I have one switch (just for the concept) -------------- | Switch | -------------- | | fa 0/1 fa 0/3 | | Client1 Client2 I wan't to give priority to the FTP trafic in both direction between Client1 and Client2 in case of congestion On fa0/1 : I apply my policy map with all the hierarchy that can be contain on it (class map, ACL) and also the configuration of the ingress queues to classify,mark and put into the queues the trafic On fa0/3 : I assume that I apply the same configuration that I put on fa0/1 right ? Since i wan't to prioritize the same trafic But what I should do for the egress part ? Put the same egress configuration on both interface ? Second case, I have two switch with a trunk between switch 1 gi0/1 ----------------- gi0/2 Switch 2 | | fa 0/1 fa 0/3 | | Client1 Client2 Same scenario like the first one for the priority thing. On fa 0/1 and fa 0/3 : I see what I have to put for the ingress part, but not for the egress part on this interface ? On gi0/1 and gi0/2 : I see what I have to put for the egress part, but not for the ingress part ? I have a good picture on how the packet is processed and where is going to be sent but I don't see how the destination process the incoming packet, you see my problem ? lol That's a damn long post, but I'm so into the topic, it's hard not to ask questions about it, you know
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Hi, Yes, this is very helpful, I'm starting to understand it a lot better with your explanation. I've got some other question for you. I warn you lol 1) About internal ring, It's like a very big buffer right ? Who hold the packets for forwarding them to the egress queues after ? How can I know the size of it ? 2) Am I forced to do Ingress policing ? If not in what scenario do we use it ? I've got some trouble to understand what are rate-bps and burst-byte values too 3) In general, what is the size of egress and ingress queue on a switch like a 2960 or 3750 ? That's it for the moment, I think... Thank you Shashank. Regards, Jonathan.
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Hello, I have a question about threshold, I cant figure what is this and how it works, could you help ? An example if you want to base your explanation on it : Distribution1(config)#mls qos srr-queue input cos-map queue 2 threshold 3 3 5 Thank you so much. Regards, Jonathan.
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Hi, Try to put VTP version to 2 on all your switchs. the command if you don't remember : "vtp version 2" I remember something about switch in transparent mode doesn't forward when they are in version 1 For the ping problem, glen.grant gave the answer
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