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How to identify packet loss and connectivity issue

December 29, 2015, 4:44 am
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Hi Support, 

I'm having packet loss and connectivity issue on my current network. I have 2 core switch (dell power connect 6224 - stack)  and all the access switch (power connect 6248) is connected to the core as backbone and running 19 Vlan segment,  All connection are connected using 10G Fibre (SFP+).  I have tested on the switches, there is no faulty on the device. 

Is the network design ok?

Please find below image. 

Dell Power Connect 6224 - Core Switch
Switch Fabric Capacity 136 Gb/s
Forwarding Rate 95 Mpps
Up to 8,000 MAC Addresses

Dell Power Connect 6248 - Access Switch
Switch Fabric Capacity 184 Gb/s
Forwarding Rate 131 Mpps
Up to 8,000 MAC Addresses

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Dell Powerconnect 6248 Layer 3 - sometimes poor or unanswered pings on vlan gateway ip

December 29, 2015, 9:09 am
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Hi,


i have three 6248 (firmware version: 3.3.13.1) configured as vrrp Gateways, one is master and the others are backup.

I have different vlans, all of them are routed vlans.

In some cases the vlan gateway ips are not pingable or the answer is very slow, but if i did a ping between the hosts in different vlans everything works perfect


The vrrp seems to work, i have no errors and the master role is always at the same device.

Does anybody have a hint for me?

Regards,

Sebastian

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OID for PowerConnect 3548

December 29, 2015, 10:30 am
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Hi,

I require the CPU and Temperature OID's for a PowerConnect 3548

Any help would be appreciated

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Dell Powerconnect 2824 Single port to Multiple Vlan

December 30, 2015, 1:20 am
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Hey,

I have a Dell powerconnect 2824 Switch and i want to assign Multiple Vlan's to ports 4-12. 

So, basically i want ports 4-12 be part of 4 different Vlans. 

The reason is because i want to connect all 4 Vlan's to my ESXi server. 

I cant figure how to make this work with this switch. If someone could please Help.

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X Series Vlan General Port

December 30, 2015, 3:43 am
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Hi all,

I got some problems with VLAN on a Dell X1026  switch.

I configure 4 ports as general ports, with Pvid=50 (tagged with id 50) and member of vlan 50 tagged and vlan 1 as untagged.

According to page 140 of the manual, if the device transmit untagged, the switch performs tagging and traffic egress is tagged with  vlan id = 50.

I attached two untagged devices to these ports but I can't ping in neither direction  (ip addresses manualy assigned).


I tried to config the ports as access with Pvid=50 and I can ping in both directions, but with general ports it doen't seem to work, even if I set general mode with a sigle  vlan id.

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Switch blocking ISP traffic?

December 30, 2015, 6:41 am
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Hello,

We have a 3324 that has two different ISP's plugged into a single vlan that distributes to two firewalls.  It's essentially acting as a dumb switch.  We had recently upgraded our ISP to a higher speed which the 3324 doesn't support since it's 10/100.  We had a spare 5324 that I was going to transition over to.  I configured the switch exactly the same and plugged in the lines. 

However, only one ISP was working.  The other was dead.  There weren't even any link lights for that ISP line.  I combed through the settings and tried a few different settings, but nothing was working.  I decided to go back to the 3324 and run a line to the 5324 to do some testing. 

I was initially not getting any traffic, but I disabled STP on the port that came from the 3324 switch and I was able to get traffic.  I decided to leave it disabled and try the swap again.  Again, it did not work.  The link lights were dark once again.

Would there be any reason why the 5324 is blocking the ISP traffic?  I tried plugging in a dumb switch and it worked immediately as well. 

Any help is greatly appreciated.

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show interface disable cause (N2000)

December 30, 2015, 9:10 am
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Dear Expert,

If the port-channel is disabled on a N2000 switch, how can we find out the cause of it? Is there any command to show this?

Thanks,

Sam

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N2048 dot1x monitor mode issue

December 30, 2015, 10:47 am
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I have dot1x working with certificate based RADIUS auth against NPS.  For some reason, though, when I turn on monitor mode with the command "dot1x system-auth-control monitor" as described on page 293 of the user guide I'm not able to gain access to a port without successful authentication.

My understanding was that monitor mode should mean the port would authorize even if authentication failed?  So for instance, I turn on monitor mode, then disable 802.1x wired authentication on a windows supplicant.  When I plug in to the port it stays as unuathorized in show dot1x, and I'm never able to pass traffic.

Is there something about monitor mode I've misunderstood or failed to implement correctly?

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Powerconnect M8024-k switch failed as primary switch in M1000e module group A1.

January 1, 2016, 12:02 pm
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There are TWO switches being used, NOT TRUNKED together, but LAGed together at the CISCO NEXUS switch. The switch in slot A2 is running fine with each M620 blade using dual 10Gb daughter cards for the NIC's. We have 11 M620 blades running Linux and Windows applications in the M1000 enclosure. The switch is HOT swappable, but will require some minor FW updates and the LACP configuration for this specific switch to be updated upon insertion into the M1000. Does anyone know if any gotchas with this process? Should I stop all servers if possible? Can I 'offline' this A1 port of something while I do the FW updates and configuration or something like that then bring this online? Thanks in advance for any help, tips, etc.

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Dell PowerEdge M1000e - TenGigaBit interface showing 40000 Mbit speed

January 4, 2016, 4:45 am
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I all,

I got the Aggregators configured as a stack. The uplinks I have configured are Te 0/52 and Te 1/52 and this 2 interfaces are part of a port-channel.

Te 0/52               Up     10000 Mbit Full   --
Te 1/52               Up     40000 Mbit Full   --

I cannot understand why a 10 gbps display a speed of 40 gbps. I have another cage with the same configuration working well and forming a port-channel with no problems.

Thanks in advance.

SR

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Dell 2848 Radius

January 5, 2016, 7:16 am
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Hi,

I am trying to enable Radius authentication on an 2848 (to W2k12).

I've tried following this guide - http://www.darylhunter.me/blog/2010/06/dell-powerconnect-radius-windows-server-2008-nps.html
or this older one http://www.dell.com/downloads/global/products/pwcnt
/en/3424_radius_auth_using_msserver.pdf.

Both require configuration on the switch via telnet using the aaa command.

Now as it seems the 2848 does not have that particular command.

I have set up the switch to my best knowledge using the GUI (according to info from manual), but its not working.

Is there a guide working for the 2800 series on how to configure this on Switch/Remote side?

Thanks

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x1052 management from desk

January 6, 2016, 10:37 am
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I have three PowerConnects 2748 where I was able the below in italics so I was able to manage the switches from my desk.

http://en.community.dell.com/support-forums/network-switches/f/866/t/19353942

"An option is to externally loop back a vlan 1 access port to a vlan XX access port.   This will allow you to manage the switch on any vlan.  Of course this burns 2 ports, not just 1.  But these switches are inexpensive, so you may have a hard time finding a less expensive solution just to avoid managing on vlan 1 or using the external loopback hack."


I tried to do the same exact thing on the x1052 but it wont work. Is there another way? I saw this post:

en.community.dell.com/.../19340218

but i didn't really understand what they meant. Any help here would be great. Thanks.

 

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IGMP snooping on a stack

January 8, 2016, 1:56 am
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Hello,

I have 2 N4032F in a stack.

The switches are for a VSAN cluster.

I want to enable IGMP snooping so I can use them for a 2nd VSAN cluster (in a different VLAN).

At the moment I have not set up any VLANs so the current cluster uses the native VLAN 1.

What are the proper steps that I have to do in order to enable IGMP with the minimum downtime?

Thanks

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connect sonicwall tz215 with dell 6248p

January 9, 2016, 10:54 pm
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I'm currently setting up the powerconnect 6248p switch with sonicwall tz215 router. I'm trying to make the switch as simple as possible. The router will do the WAN and DHCP and the switch will route the traffic between subnet PCs and WAN from sonicwall for the internet access.

I have reset the switch to default and vlan1 as management vlan. should I start to create vlan 10 for subnet IP which is same as sonicwall's LAN subnet?

Sonicwall x0: WAN (Fiber) ; x1 : WAN (ADSL2+) ; x2 LAN (10.0.0.x)

Dell 6248p port 44: connection with sonicwall x2

Please recommend any step by step config, thanks a lot.

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Dell Switch 3524P

January 11, 2016, 7:35 am
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dears,

are Dynamic ARP protection and IP source guard supported on 3524P or 3548P dell switch 

and if not on which series are supported and equivalent to 3524P switch.

thanks

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stack-mac persistent

January 11, 2016, 7:44 am
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Hello all,

Our company recently acquired four Dell N4064F switches.  We have two in one COLO facility and two in another, both places the switches are in a stack of two acting as one logical switch.  It has come to our attention through testing that the cross stack LACP port-channels connecting the two stacks and connected to our corporate headquarters network temporarily go down when the stack master has a failure (powered down, etc).  When one of the switches in the stack goes down, traffic should be able to continue passing through the active link in the LAG, but there is a long pause until the active link starts passing traffic again.

So when this master goes down it looks to be that spanning-tree sees a topology change and begins to go through its calculations.  Once the port-channel goes to a forwarding state traffic begins passing again, but not until about 20-30 seconds later.  

What I didn't understand about this is why the port-channels connecting to other switches are going down at all.  Sure one of the links goes down, but not both which I would think should keep the port-channel link status still up.  I came across some forums where people had this same issue with Cisco 3750s and how the command 'stack-mac persistent timer 0' can solve this.  Does anyone know if there is something comparable to this on the Dell N4000 series switches?  I've opened a case with Dell's support and am still waiting to hear back on it.  Below is one of the forums where I found this:

supportforums.cisco.com/.../stack-mac-persistent-timer-lacp-port-channels-c3750          

www.cisco.com/.../69979-cross-stack-etherchannel.html

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PowerConnect 5524P - additional name in certificate

January 12, 2016, 1:53 am
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Setting up VLANs on stacked 6224s (iSCSI and LAN)

January 12, 2016, 9:27 am
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I have a pair of Powerconnect 6224 switches running in a stacked configuration. Up to this point, I have only been using them for iSCSI traffic, so there was never a need to setup any VLANs, etc. My current network configuration has changed, so now I need to run some LAN (server) traffic over the same switches, necessitating the use of VLANs. I will also need to uplink the switches (LAN traffic) to another switch.

I know little about VLANs, so I've been pouring over every article I can find, but I still have some questions on the setup. I'd like everything to be as redundant as possible, and you can assume I'll be starting with an out-of-the-box configuration, running the latest firmware.

My current LAN traffic is on the 192.168.1.x subnet.

My current iSCSI traffic is on the 192.168.5.x subnet.

I have an EqualLogic PS4000 series SAN with two controllers (1 management port and two iSCSI ports per controller).

I have two VMware hosts with two network ports each dedicated to iSCSI traffic.

For redundancy, does it make sense to split each host and SAN controller between the two switches (i.e. VMHost1 iSCSI1 to switch 1, VMHost1 iSCSI2 to switch 2, VMHost2 iSCSI1 to switch 1, VMHost2 iSCSI2 to switch 2, etc, etc), or does that even matter since the switches are stacked?

I'm thinking I could do what I need with just two VLANs (switch management can run in the LAN subnet without issue)., but I'm not sure what, if any, trunking and routing I need to do to get it all working in a redundant fashion.

I'd like ports 1-10 on each switch to be configured for iSCSI traffic from my VMware hosts and PS4000 on the 192.168.5.x subnet.

I'd like ports 11-24 on each switch to be configured for LAN traffic (and switch management?) on the 192.168.1.x subnet.

I'll need to uplink (Both switches? Trunked ports?) the LAN VLAN to another switch on the 192.168.1.x subnet.

Now... Can someone point me to some good articles, guides or tutorials that I might be missing? Or, if anyone has suggestions, I'm all ears.

I found this excellent guide...

... but I'm not sure if I can apply quite the same setup in my situation (substituting my LAN VLAN for his management VLAN).

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Can a Force10 MXL blade handle non FCoE traffic?

January 13, 2016, 5:09 am
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Hi.  I'm inheriting an M1000e with a couple of Force10 MXL switch blades installed.  The chassis has no other 10GBASE-T switches.  Since I have no plans on using FCoE, can a Force10 MXL be used for standard Ethernet traffic (non-FCoE)?  Or, do I need to procure another switch?

Thanks.

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Multicast in Powerconnect 81xx

January 13, 2016, 6:00 am
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Hi,

I must upgrade a cluster of switch Powerconnect 81xx from firmware 5.1.0.1 to firmware 6.1.2.4 or higher. This switches stream television in multicast. Could you please help me to configure the multicast on the firmware 6.1.2.4 or higher.

The PowerConnect 81xx is my NETWORK CORE, there are other switches PowerConnect 55xx in my network. The upgrade of the PowerConnect 55xx from firmware 4.1.0.8 to firmware 4.1.0.20 doesn't affect the multicast.

Here's a part of my running config of PowerConnect 81xx

interface vlan 122
ip address 192.168.122.254 255.255.255.0
ip igmp
ip igmp version 2
ip pim
exit
interface vlan 124
ip address 192.168.124.254 255.255.255.0
ip helper-address 192.168.104.21
ip igmp
ip igmp version 2
ip pim
exit
interface vlan 125
ip helper-address 192.168.100.23
ip helper-address 192.168.100.24
exit

no ip igmp snooping
no ipv6 mld snooping
ip multicast
ip igmp
ip pim dense
no iscsi enable
sflow 2 destination owner 2 notimeout
sflow 2 destination 192.168.100.27
!

Thanks

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