Cisco :: Serialization Delay From The Wire / Interface Onto Router / Switch Backplane / Fabric?
Feb 28, 2013
So the delay is introduced getting data onto the wire. However say there are two hops to the destination server, each hop is via equal connectivity speeds say 1G interlinks.
Question:
Is there serialization delay FROM the wire/interface onto router/switch backplane/fabric?
Is the serialization delay from backplace/nic back onto the wire to the next hop? - Or if using a switch with equal in/output speed transmitted without serialization?
What happens with a routed interface vs switched?
Most articles discuss the latency induced between the much higher OS/NIC interface out to the wire, but not the switch/router serialization that does or doesn't occur.
As per my understanding, Cisco Nexus 2232 can only connect to HP c7000 Chassis if we are using a Pass Through Switch in the HP c7000. Cisco Nexus 2232 can only connect to End Hosts and not to a switch. Is there a New Feature added in Nexus 2232, which enables it to connect to a Switch like HP Flex Fabric ?
i am facing time daely issues on cisco 2960 s series switch while booting .It is taking time for electing masrer and sleeve for stacking.can i disable the election process for stcking while booting.
I had setup a lan infrastructure with 5 3750 stack swithes. In these 3 of them are in one stack which is acting as access switch, 2 of them in another stack which is as core switch where all the SVI is configured. Now, when i tried to ping from our edge pc which is connected in access switch to default gaeway, which is configured in core switch, the ICMP is getting delayed . But when try to ping from the same edge pc to another user PC, it is getting less tahn 1 millisecond icmp replies.
why icmp is delaying to default gateway , but working with another edge to edge pcs without any delays?
I noted that my router (Linksys3200) has delays or lag on the average of 5 to 10 seconds apart, but random, while playing on line games. While continuously monitoring delays (ping) with a program called Ping Plotter, it ranges from 25ms to 65ms. When not gaming, just surfing the net, the ping is zero and once in a great while a 5ms or 6ms spike may occur.
Am I looking at a malfunction in the router or the computer? or Is this normal?
I have been trying to understand from a long time about the throughput capacities of variety of Cisco Routers and Switches. Have searched over a million pages on cisco.com for data sheets/documents/etc. but havent succesfully got a single document highlighting all of what i need.
I have got queries on the below issues:Which model of Router can support upto 2Gig's of WAN Internet connection running BGP? Any list of routers and switches supporting variety of throughput's from 1 MB to 1 GB.I have heard some experts stating "Switches don't have throughput concerns as they switch the traffic and don't need to route traffic" How true is the statement?? and if it is, Why do we require 6500's instead of 3560 Distribution Switches.
Are there any plans to support a "shared backplane mode" like on SUP6-E that enables the use of four 10G oversubscripted uplink ports in redundant mode? now there is support for up to two active 10G links in redundant mode.
I just got an e4200 refurbed router, and it's been working great except for one problem I'm having. I have Comcast cable with Ubee D3.0 modem. For some reason, there will be a random 4-8 second delay when going to certain websites. While this normally wouldn't be a problem, it occurs quite frequently with Google.com and we definitely can't have that. I've updated to latest firmware. Ran ping test to find optimal MTU, went with 1500. To be sure it isn't a DNS issue, tried accessing Google by IP addy and getting the same delay. The delay seems to occasionally occur with Facebook as well, at one point I couldn't even get to Facebook and had to release/renew ipconfig. I have Mac address cloned if that makes a difference.
I am looking at the utilization on a Catalyst 3560-E. I am running a test with eight 1 GIGE links RXing at 95 % utilization. All of the traffic is going to a TenGigE port. The device on the TenGigE port is echoing back all of the traffic received, so the 1 GIG links are TXing at 95% as well.When I do a "show controllers utilization", the port utilization numbers are correct, but the fabric utilization is higher than I would expect. The fabric should be 128 gigbits / second in this switch, and there is 7.6 gigabits TX/RX to the ten gig port. The fabric utilization is at 49%. I would expect 7.6 / 128 = 5.9% or possible double that. [code]
I got a new computer and I connected it with wire to my router.The router is connected to a modem. 2 other computers are connected on this router wireless .My new computer doesn't recognize the router/modem. I tried to connect thru broadband (I don't know what is means) but it seems to be not working because I put the right username and password and I get an error from the modem number.I also tried PPPOE which I also doesn't know what it means doesnt work.How do I connect to the internet!?#@!?
i am a gamer and i rely on the internet to do some buisiness as well, a few months ago my router started randomly dropping me from my connection and then 10 seconds later the connection is back up. now i know alot about computers and cant figure out why this is happening. it seems that the problem starts with skype. when i play some games while in skype(we use it as a communication device for the games) i will get dropped from skype and from my game, then skype reconects and i can reconect to the game but 5 minutes later it happens again. i have at&t and am using a 2701HG-B, my donwload speed is a max of 3mbps and usualy is around 2.7mbps. i have contacted at&t multiple times, i have reset my router multiple times but it hasnt fixed the problem. at&t stated that i am demanding too much bandwith from my connection. i feel that this info totally crap. when im on with just 1 of my many devices at 3am and all i am doing is playing a game and talking on skype and it disconnects, there is no way i am demanding too much.
I have a seagate black armour Nas hard drive that I am trying to hook up through a 2wire modem/router. The router isnt upnp compatible, I was wondering if there is someway I can make this nas hard drive work with this router some how even though hard drive is upnp?
My housemates have been having a trouble with network coverage in my house, the router is located in the basement of my house, perfect for me as my room is also down there (Ethernet). Unfortunately my housemate in the attic room's signal seems to be a problem. I'm wondering if it would be possible to remove one of my routers two antennas solder some copper wire to the spot it was removed, then have the wire go up to the 1st floor and re-solder the antenna up there (mount it on the wall or something). I'm confident with the practicalities of actually doing this, but I'm not that techie when it comes to electronics. I'm not sure whether it would need more power to boost it over such a distance.
I am trying to hook my bluray player up wirelessy I have a 2 wire modem I also bought a wireless router and a wlan to hook to the back of the bluray is this right
we installed copper and fiber sfp modules in the 2232PP and none would link up. we pulled the sfp modules out and entered the speed 1000 command and re-inserted the module with no success. the same sfp modules works fine in every other cisco device. we must be missing something. running latest nx-os software.
COH-Nexus-02# sh int Eth101/1/1 status -------------------------------------------------------------------------------- Port Name Status Vlan Duplex Speed Type --------------------------------------------------------------------------------
I've had a 2Wire gateway that I got from AT&T for about 5 years. Although I've seen terrible reviews for 2Wire, I've had pretty good luck with this one. Now the Power light is a steady red and only light on. Tech support says that it's most likely the power adapter.As I understand, most what are called modems or routers today are a combination of these two, is that right? I see them in stores ranging from $30 to $200 or more, and they all say they do the same thing - almost identical wording. If it turns out that my adapter is good, what should I be looking for?
Im new to cisco routes, Im traing to configure a 1711 routes with a dsl 2wire routes, my problem is that Im able to ping anywhere in the routes, but when Im on my computer I can only ping the interfaces on the router but no the 2wire route that gives me access to the internet.
Need clarification on the VPC with 5k and 2248 Fabric Extenders. My question is can each fabric extender uplink to two different 5ks, and at the same time, have servers connected to two both fabric extenders with a VPC.So basically, the server NIC will team with two different fabric extenders, and each fabric extender will connect to two different 5k's.
How to properly power down the Nexus 5000 and the fabric interconnect switches? I have looked up and down cisco's and google web for steps, but they are all coming back with the answer to just disconnect the power cables after you have power down all the windows os and exs servers. Before i do that, I just wanted to make sure that that's the correct way to do it or if there are actual commands that I will need to run on the devices to properly power down. I know that the FI do have a command to reboot, but i need them to completely be power down.
There is a cisco ws-c6509,recently it appear error log “%FABRIC-SP-6-TIMEOUT_ERR: Fabric in slot 5 reported timeout error for channel 11 (Module 3, fabric connection 1)”. When I reload the device,the error log disappear.But a few days later,it appears again.I try to replace the slot 3 (WS-X6704-10GE),the error log continues.The IOS version is 's72033_rp-ADVIPSERVICESK9_WAN-M), Version 12.2(18)SXF8"
I have a router setup that worked for me for months, suddenly, it stopped detecting the wire connected from the POE adapter.When the wire is directly connected to my pc, the connection works and i have internet. But when thru the router, the WAN Light is not even lit.Btw, just for checking purposes, I tried connecting a wire from my pc to the router wan port, and the WAN light lits up.
I just installed windows 7 into my computer and I need to verify my copy of windows. I tried connect my Ethernet wire from my computer to the wireless router but it's not connecting or registering. The wireless router is a WRT54G and I can access the device ip for it but I don't know how to assign an IP address for the new computer. I already had a computer (wired) and a laptop (wireless) connected to the router. I'm using a straight trough Ethernet wire Doing the steps in the sticied post below didn't work because typing ipconfig /release didn't work?
I received the following info from Cisco's TAC and wanted to inquire further before I start reconfiguring the switch:
In a redundant Sup-6E setup, the following configuration is supported :
- 1 TenGig uplink on Active Sup and 1 TenGig uplink on Standby Sup - 1 TenGig uplink on Active Sup and 2 Gig uplinks on Standby Sup - 2 Gig uplinks on Active Sup and 1 TenGig uplink on Standby Sup - 2 Gig uplink on Active Sup and 2 Gig uplinks on Standby Sup
If you invoke shared backplane mode, the following configuration can also be supported:
- 2 TenGig uplinks(blocking) on Active Sup and 2 TenGig uplinks on Standby Sup - 2 TenGig uplink(blocking) on Active Sup and 4 Gig uplinks on Standby Sup - 4 Gig uplinks on Active Sup and 2 TenGig uplinks(blocking) on Standby Sup - 4 Gig uplink on Active Sup and 4 Gig uplinks on Standby Sup
Here's the command and information about the "shared-backplane" mode :- [URL]
Currently, we have 2 SUP 6-Es(Module 5 - Active and Module 6 - Stand-by) setup in a redundent mode. I am planning on changing the redundent mode to the shared backplane mode so I can use 2 TenGig converters to uplink 2 access-switches. We purchased 2 TenGig converters and here is how I am planning on using them:
1- One will be used to uplink to two 3750 switches(stacked) 2- One will be used to uplink to a 2960 using a Gig SFP
My questions are:
1- Do I have to install the 2 TenGig converters(4-Gig Uplinks) in the same Module? Or can I use one one in module 5 and the second one in module 6? 2- Will changing the redundant mode to the shared backplane mode require rebooting the switch or disrupt the funtionality of the other linecards?
I wired it all up correctly, and Continue to get "error 322: check router" upon every attempted install. I did some research and tried releasing and renewing IP amongst restarting all networking devices AND PC's. Peculiar enough, I could connect AND get online wirelessly from a netbook, but neither of my 2 PC's could connect via a wire. I got a defective router, is it possible the ports are malfunctioning? because the lights are on, but 3 or all of the 4 lights are continually on when only 2 ports are plugged in
Just purchased WRT54GL for family friend to extend the wireless range of their DSL via 2Wire ATT modem Wireless router. One desktop computer will stay wired to the 2Wire and laptop or 2 will connect to the WRT54GL since the 2Wire cannot reach into the yard (metal buiding). I've seen several examples of connecting two WRT54G together. I Can I do that well with std Linksys software or would I be better off downloading Tomato or DD-WRT third party?
