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I have two LAN networks in a large building which are connected and are where communicating but there is a problem with one of the networks which brings the whole network offline. Yesterday I went around plugging the switches in one by one and managed to get one of the networks back online by completing removing the other network, but I was wondering if there was a way to implement a system or price of hardware which will prevent both networks going offline if one network goes down?

Many thanks, any help us appreciated x

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from Enterprise Networking Design, Support, and Discussion.
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Last Friday one of our core switches in the data center started showing output errors on all interfaces.

It is the secondary in a vPC pair with another C9364C. The other C9364C showed errors during this period.

This has happened on and off since Friday.

The error counts aren’t high but I do notice them and get alerts via my monitoring tools.

I also noticed the CPU going up by about 10% and it has stayed that way since. This is however has bought it inline with the over 3 C9364C in our environment. So before this it was the odd one out……

I have logged a case with TAC and their response was ‘Maybe something in the network barfs garbage periodically’

I find it weird that we are getting output errors on physical interfaces that would be caused by a device somewhere within the network.

What generally do others see as the cause of output errors?

We have had a lot of issues with 100Gb SFP’s in these switches with links flapping a lot and the only way to fix it has been to RMA the SFP’s. But I find it hard to beleive all SFP’s would be stuffed at the same time.

I just remembered we had a interface eth1/12 that started flapping during this period, looks like another failed SFP. I wonder is this interface with input errors would then populate through others via outputs?

submitted by /u/rotame12a
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I’ve been involved in networking for a few years but am defiantly not an expert and I’ve never been involved with ISP/Carrier networking. I’m curious as to the application of the way that our ISP has configured the handoff / the equipment provided.

We have a dedicated fiber line with Lumen (CenturyLink) - due to our location, this is the cheapest because we are right by part of their backbone network. They have a switch that is doing the conversion from fiber to copper, that is then feeding a Lumen provided router, and then they handoff the connection and we run it into our routers.

What is the application of the ISP having both the switch and the router?

Thanks for indulging my curiosity.

submitted by /u/cbeals
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I have an Orbi RBK50 kit and, just yesterday, switched from Spectrum to Fios for my ISP. Verizon ran Ethernet from the ONT to my router so there is no Verizon router in the mix. Almost everything is working fine except for Instagram/Facebook on mine and my wife’s phones (iOS) and, from what I’ve noticed, previously visited https sites in Firefox on my PC (these same sites work fine in Edge).

I’m not a networking expert, but I’m guessing there’s some kind of issue with SSL certificates and the change in IP as a result of changing providers. Am I correct? If so, how can I resolve this and if not, what else do you believe it can be?

Thank you for any help with this.

submitted by /u/veedems
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Well it’s official, I’m a full time streamer. This is my dream and I want to give it everything I got before saying it’s never going to happen. I have faith this can happen but ill need to grow more. Thank you for the support up to this point but it’s time to push it further! The #dubclub will grow beyond belief, let’s make this happen! link is also in my bio. #stream #streamer #support #twitch #streamlabs #streamlabsobs #pathtopartner #pathtopartnership #twitchstreamer #pcgaming #gaming #SJGaming #supportmentalhealth #supportsmallstreamers #corsairgaming #goaldriven #straightedgemotivation #positiveoutlooks #mentalhealthstreamer #positivegaming
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I am looking for a tool that could intercept traffic between a host and the network (essentially a network tap), with the ability to send (clone) all traffic to a remote network.

Use case: Server at a site in one state with a custom application - pick up that traffic without affecting production workloads - and push a copy of the traffic across the WAN into an isolated lab network for analysis (testing with a NIDS/IPS/IDS solution).

I think this could be implemented with Linux, a tunnel, and a couple of Raspberry Pi’s - but the customer is looking for a commercial solution.


submitted by /u/YosemiteSamHouston
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Pulling my hair out with this - Have a ton of FS stuff without any issues, but none of these Cisco compatible AOCs seem to work.

Both 3850s are running 16.9.6 and connected via DAC - I replaced one DAC with an AOC and it doesn’t even see the SFP+ transceiver, except for this:

*Oct 21 20:28:29: %PLATFORM_PM-6-MODULE_ERRDISABLE: The inserted SFP module with interface name Te1/1/4 is not supported

Any suggestions what I’m doing wrong, or are the AOCs just not compatible?

djc-tmp-sw#sh int te 1/1/4

TenGigabitEthernet1/1/4 is down, line protocol is down (notconnect)

Hardware is Ten Gigabit Ethernet, address is 08cc.a7ef.7638 (bia 08cc.a7ef.7638)

MTU 1500 bytes, BW 10000000 Kbit/sec, DLY 10 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

Keepalive not set

Auto-duplex, Auto-speed, link type is auto, media type is unknown

input flow-control is on, output flow-control is unsupported

ARP type: ARPA, ARP Timeout 04:00:00

Last input never, output never, output hang never

Last clearing of "show interface" counters never

Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

0 packets input, 0 bytes, 0 no buffer

Received 0 broadcasts (0 multicasts)

0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

0 watchdog, 0 multicast, 0 pause input

0 input packets with dribble condition detected

0 packets output, 0 bytes, 0 underruns

0 output errors, 0 collisions, 4 interface resets

0 unknown protocol drops

0 babbles, 0 late collision, 0 deferred

0 lost carrier, 0 no carrier, 0 pause output

0 output buffer failures, 0 output buffers swapped out

djc-tmp-sw#sh inv

djc-tmp-sw#sh inventory

NAME: "c38xx Stack", DESCR: "c38xx Stack"

PID: WS-C3850-48P-E , VID: V07 , SN: FCW2048C09W

NAME: "Switch 1", DESCR: "WS-C3850-48P-E"

PID: WS-C3850-48P-E , VID: V07 , SN: FCW2048C09W

NAME: "Switch 1 - Power Supply A", DESCR: "Switch 1 - Power Supply A"

PID: PWR-C1-1100WAC , VID: V02 , SN: DTN2050V2XJ

NAME: "Switch 1 FRU Uplink Module 1", DESCR: "2x1G 2x10G Uplink Module"

PID: C3850-NM-2-10G , VID: V01 , SN: FOC20460Q6P

NAME: "Te1/1/3", DESCR: "SFP-10GBase-CX1"

PID: SFP-H10GB-CU5M , VID: V02 , SN: F1940161068-2

djc-tmp-sw#sh idprom interface te 1/1/4


submitted by /u/dcoulson
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I’m currently evaluating SIEM solutions for my team. I’ve got some colleagues who swear by Splunk, and I understand the value, but I also appreciate that LogRhythm is a dedicated security solution and isn’t as cost prohibitive. Any input is welcome… my team has been looking at QRadar, Exabeam, Rapid7, Splunk, and LogRhythm.

submitted by /u/Ultra_Magnus95
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So i jave been trying to port forward my router for a couple of days now and i can’t seem to get it. I’ve tried making my ip static and opening firewall inbounds. All of these options havent worked for me and everytime i check it it still says its closed. Ive searched everywhere but havent found any ways to open/port forward my type of router.

PS. its for a minecraft server.

submitted by /u/DJzufnix
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@hptuners YouTube Live training starts in 1 hour hosted by Alex Peitz from @peitzperformance discussing “Supercharger Tuning”

Alex Peitz will go over positive displacement superchargers and key factors that should be considered when tuning a vehicle that has one. Stick around for the trivia question giveaway at the end of the stream for your chance to win an MPVI2.

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I’m looking into some studies of what’s currently on the horizon and what’s currently in the market for access switching. I had a few questions I was hoping you all could help me with.

What features are you looking forward to? (E.g., data analytics such as utilization/saturation for expansion planning)

When planning a deployment what features are you considering make or break? (E.g., Splash redirect via RADIUS/ISE integration)

What do you think the future of access switches are? Segment routing down to the access layer?

Of course these are all subjective to your environment, so if you could provide a bit of insight into that as well it’d be appreciated!

submitted by /u/TotallyAName95
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Now, obviously I have been away since the Tumblr change, but I felt it was needed to pop back on here for a little while.

At this point, we’ve been dealing with COVID, electoral lead up, restrictions/extreme kickdown; uncertainty and a lot of non sense for the better part of 10 months (about 260 days, if you can count that high!).

This year had affected every one of us, and we’re all dealing with our problems however we can. This is probably going to be the new normal for a while. There’s a lot of adjustment to be made.

One thing I will say, for as long as I can be here, I’ll keep this blog safe, soft, inclusive and open.

So show me your DIYs, your art, baking, animals, fun stories or whatever else that’s getting you through the craziness of 2020! Let’s spread your happiness out, and help those that might not have found that happiness to keep pushing them through.

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