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Link Aggregation between stacked N4032's and stacked 6442's

May 4, 2016, 12:25 pm
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Up until last evening,  I had a (4) port LAG between 2xN4032s & 2x6224's each in an indpendant stack configuration.  These switches are being used as a path from our VMWARE system to our corporate LAN and up until a reset of the N4032's last evening,  the configuration was working well,  atleast I thought.  

I am leaning towards this being a Spanning Tree issue on the channel being utilized.  When doing a show interface port-channel,  the port-channel had been in a discarding state since last evenings reload of the stack.  I'm looking for recommendations as to how I would go about ensuring the 4 ports being utilized in the path are configured correctly.  As of this writing,  i've backed out the LAG simply relying on a single port configured to pass the LAN VLAN traffic and it is working.  

I had ports unit1 - 1/2 & unit2 - 1/2 of the N4032 connected to unit 1-5/6 & unit2 - 5/6 respectively.  I had the port-channel mode in GENERAL adding the VLAN as a tagged member.  I had portfast enabled as well as RSTP enabled.  Any information as to how this should look between the 4 ports would be greatly appreciated.  

The overall VM-LAN traffic path is as follows;  HOST1 > STACKED-N4032 <(4PORT-LAG)> STACKED-6224 <(2PORT-LAG)> 6224 EDGE > Corporate LAN

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Foreign pdu on interface

May 5, 2016, 10:12 am
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Im getting so many of theses in the 7048P logs

any clue what would be causing this

Switch is connect 10Gig via module to Fortinet firewall and by 4 fiber ports to 4-5424 switches

thks

Glenn

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switchport mode general & switchport access

May 8, 2016, 9:35 pm
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What if a switch port is configured withc switchport general PVID and switchport access vlan ? Which one is invalid?

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unable to access VLAN Management Port Dell N2024

May 9, 2016, 2:11 am
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hi all ,

    need help how to change the management vlan 1 to vlan 80 that i created . The CLI Command not same as power connect 6224 as follows :

enable

configure

ip address vlan 80

(this does not work with power connect dell N2024)

I need to access this switch instead of using hard wire patch cord to port 24 (VLAN 1) port 1 to 23 (VLAN 80)

thanks for the help 

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Problem with rebooting switches 5548 in stack

May 9, 2016, 2:35 am
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Hi,

First I would like to describe current configuration:

I have 8 switches: 5548, all have the same (the newest) firmware and boot image. I've manually set stack id from1 to 8. During this operation, the switches were not connected with each other. I've powered off the switches and connected Dell HDMI cables following the manual: port_1 on switch_1 to port_2 on switch_2, then port_1 on switch_2 to port_2 on switch_3 and so on... and at the end port_1 on switch_8 to port_2 on switch_1, forming the ring.

Problem:

After powering on the switches, they displayed stack id as I set, but..... after a while, switch number 6 changed it's id to 0 and reboots. After it startup, id was 6, but... switch number 8 changed it's id to 0 and reboots. This process repeated over and over again.

I try to remove connection beetwen switch_8 and switch_1 (breaking the ring), and this change nothing, but....

.... when I restore link between switch_8 and switch_1, and remove link beetwen switch 7 and 8, the switches stops rebooting !!!

I've tried to change HDMI cable beetwen switch 7 and 8, but this not help. It doesn't matter if the stack have full ring, or not, if there is a link beetwen 7 and 8, the switches reboots.

Could anyone give me some tips, where to look for any couse that behaviour??? I have another stack build with the same switch model, but it consist 4 units and everything is ok.

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Question about "Networking Best Practices - Connecting Two Switches" article

May 10, 2016, 3:25 am
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Hi,

I would like to warn, I'm newbie :-(

Ther is an example "Layer 3 + Layer 2 with an external router" in this article. My question is: how does the switch B know where is the router? We add route only in switch A? And general link has allowed vlan only 2 and 3.

Best regards,

Mariusz

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Dell 6248P - Guest Wifi VLAN config

May 10, 2016, 4:38 am
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I am attempting to recover the set up of a VLAN. The VLAN is for guest wireless traffic to go through our main switches and out to an ADSL router but I am running into some difficulties.

We have 3 Unifi AP-AC model access points. Each access point has a physical network connection to 1 out of 4 Dell 6248 switches which are currently in a single managed stack like so.

AP 1 -> Switch 1 Port 40

AP 2 -> Switch 2 Port 36

AP 3 -> Switch 3 Port 17


The managed stack and AP's are currently using the 192.168.1.0/24 on VLAN 1 - Default and I have created a VLAN 10 - Guest.

The APs have two SSID WLANs, "corporate" which is also on the 192.168.1.0/24 range and a "guest" which is on 192.168.99.0/24. I have set the "guest" to tag its traffic with VLAN 10 and no DHCP is set.

I have set the 3 ports above as General Mode, Allowing Any frames and in VLAN - 1 these are untagged and VLAN - 10 they are tagged.

I have also set a Zyxell Router with a static address of 192.168.99.254 into Switch 4 Port 24 and set this to Access mode for VLAN 10.

The router is set to provide DHCP for the 192.168.99.0/24 range.

Now when I connect a laptop to our "coporate" WLAN, everything works fine. I receive an DHCP address from our server and I can reach everything as normal.

When I connect to the "guest" WLAN, I do not receive a DHCP address additionally I am able to ping equipment on the VLAN 1 subnet which I thought would not be possible.

Can someone take a look at this config and let me know what is wrong with it?

!Current Configuration:
!System Description "PowerConnect 6248P, 3.3.12.1, VxWorks 6.5"
!System Software Version 3.3.12.1
!Cut-through mode is configured as disabled
!
configure
vlan database
vlan 10
vlan routing 10 1
vlan association subnet 192.168.99.0 255.255.255.0 10
exit
sntp unicast client enable
sntp server 192.168.1.18
stack
member 1 5
member 2 5
member 3 5
member 4 5
exit
switch 1 priority 12
ip address 192.168.1.212 255.255.255.0
ip default-gateway 192.168.1.227
ip domain-name my.domain
ip name-server 192.168.1.18
ip name-server 192.168.1.19
ip name-server 192.168.140.2
ip routing
ip route 192.168.99.0 255.255.255.0 192.168.99.254
interface vlan 10
name "Guest"
routing
ip address 192.168.99.212 255.255.255.0
bandwidth 10000
ip helper-address 192.168.99.254 dhcp
ip mtu 1500
exit
username "admin" password a8e64cdc85228f4c837da747958ffd74 level 15 encrypted
dhcp l2relay
dhcp l2relay vlan 2,10
!
interface ethernet 1/g7
channel-group 2 mode auto
exit
!
interface ethernet 1/g8
channel-group 1 mode auto
exit
!
interface ethernet 1/g40
switchport mode general
switchport general allowed vlan add 10 tagged
exit
!
interface ethernet 2/g36
switchport mode general
switchport general allowed vlan add 10 tagged
exit
!
interface ethernet 3/g2
channel-group 2 mode auto
exit
!
interface ethernet 3/g17
switchport mode general
switchport general allowed vlan add 10 tagged
exit
!
interface ethernet 3/g48
channel-group 1 mode auto
exit
!
interface ethernet 4/g24
switchport access vlan 10
exit
exit

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VLAN Mirroring

May 10, 2016, 9:26 am
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Hi,

I have a stack of six 5548P switches with 2 VLANs (Voice and Data). We recently bought a call recording application that requires to mirror the voice traffic we want to record. Is it possible to have the voice VLAN as interface source for port mirroring?

I need to mirror the voice traffic from 60 devices, that would be 60 physical ports and I know there's a restriction of max 8 source ports per unit.

Any idea on how can I accomplish this?

Thanks

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N Series Switches SNMP info

May 12, 2016, 5:59 am
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I had a questions about snmp info from the N series switches.  Specifically an N3024 with the latest FW.

When I query the switch, or more so, add it to my monitoring systems, it pulls in all "link aggregate 1-128" ports, regardless if they are configured or not, as well, they reflect that the interface is down by default. 

If I were to "shut" the port, then they are recognized as "admin down", but now my config reflects 128 port-channels that are "shutdown" making my configs a little unruly.  

Are there any work arounds or commands to disable/hide the link-aggregate (port-channels) from either being included in the snmp scans, or hiding them from the configuration file when editing the switch configs?  

If you do a "show int des" every interface that is listed there is what snmp pulls into monitoring.  It seems silly to pull 128 interfaces that aren't configured, as well as not disabled.  I wouldn't think that would be the ideal "default" logic.

Any ideas?

Thanks,

Jeff

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x4012 high availability configuration?

May 12, 2016, 11:07 pm
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Has anyone been playing with this new switch? I see it is poised from Dell to act as a backend core switch. It seems the x-1052? is specified in places to establish redundant connection to other hosts. What I'm wondering, has anyone tried just LAGing the x4012 together for 10Gb connection using SFP's or the QSFP's? What is QSFP? Trying to configure 4 or 6 of these in a HA fashion so that if any one of them, or a cable goes down, the hosts are still running.

thanks!

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M6220 switch stack problem

May 13, 2016, 8:38 am
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Hi All

I have a stack of 4 M6220 switches, I have just updated the firmware to 5.1 all went well apart from switch 1 a member switch.  I upload the image and set the switch to use image 2 the reload fails and the image disappears, now the auto update just keeps cycling and the switch 1 has been greyed out in all the settings.  It continues to say updating in the GUI.

Any ideas how I can force the update onto that last switch, it is very frustrating and time consuming - can anybody help?

Thanks

Eric

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VLAN config on PowerConnect 5524

May 15, 2016, 10:07 am
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Hello, I would like to set up a simple VLAN to isolate SAN iSCSI traffic on my PowerConnect 5524 from the rest of my network. I am using the OpenManage Switch Administrator. I want to make absolutely sure I am doing it right since these are business critical production systems. Using the 802.1q, I understand that I need to:

  1. Create a VLAN: I have Created VLAN 2 in Switching/VLAN/VLAN Membership
  2. Assign PVID (since the MD3200i nor the Hyper-V hosts are not VLAN aware, right?): I don’t understand the purpose of the settings at Switching/VLAN/Port Settings. Do I change Port VLAN Mode to General? Keep Reserve VLAN to None? Change PVID to 2?
  3. Assign membership to the port – containing in Switching/VLAN/Port settings in VLAN List add 2 as Untagged. Do I Admit All or does it matter? Do I Disable Ingress Filtering?

Am I missing anything else, or is there anything else I need to consider?

Thank you for any answers and suggestions you can give,


Ken

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N3048P odd log entry

May 15, 2016, 6:56 pm
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Hi all,

Doesn't seem to be causing us any problems but I have noticed this error showing up fairly frequently in the logs for a couple of weeks now, in our stack of 3 N3048P's. 

"DOT1Q Cannot configure VLAN tagging for an access port 130"

Is odd as it doesn't list a proper number like gi1/0/1 etc.

Currently running firmware version 6.2.7.2 so could use an upgrade, but haven't had this issue previously. Has anyone else seen this before ? 

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Spanning tree routing bridge

May 16, 2016, 1:19 am
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Good day to All

I have a problem in my network with an old device with a 10mbit half duplex nic - we have Powerconnect N3048 switches in the rack - we found that they don't play well with the old device, so we added an older switch 1000/100 to do the translation so to speak.

The problem now is that STP was not configured at the time and the older switch has taken the role of routing bridge.

My question is - if I now configure the N3048's to be the route bridge, will I be able to do it without affecting the production network traffic, or will I need to down the network to do the change?  Will the change to the N3048's force the older switch to relinquish control or will they fight?

Many thanks in advance

Eric 

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PowerConnect 6248 VLAN IP communication issue over trunk

May 16, 2016, 5:15 am
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Scenario:

I have a switch (6248 without IP routing) which hangs off my core switch (6248 with IP routing) via cat5 cable, ports either side configured as trunk carrying vlan X.

Problem:

PowerConnect 6248 acting as Layer 3, created VLAN IP (directly connected,   vlan X). Devices on the switch in vlan X work without issue, ping out, ping in, works. Devices on the "hang" switch, in vlan X seem to work, I can ping externally, receive pings from external sources, I see no issues with the service EXCEPT...

If I ping the VLAN IP(it's GW) from the device on the "hang" switch I get massive loss e.g.

64 bytes from x.x.x.x: icmp_seq=5 ttl=64 time=131.578 ms
64 bytes from x.x.x.x: icmp_seq=18 ttl=64 time=1.131 ms
64 bytes from x.x.x.x: icmp_seq=19 ttl=64 time=23.122 ms
64 bytes from x.x.x.x: icmp_seq=20 ttl=64 time=45.744 ms

I figure the switch receives the ping, goes to return it, thinks it's "directly connected" so doesn't try to pass it back over the trunk port, but that said **if I ping the device on the "hang" switch from an external source it works flawlessly**

Question:

Has anyone had this and corrected it, if so how and what stupid thing did I miss to created this headache?

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PowerEdge M1000e 10gb nightmares

May 17, 2016, 6:08 am
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Hi, I have a Dell M1000 chasis with 3 Dell PowerEdge M620 and 4 Dell PowerConnect M6220.

I have installed the 10gb TBase card into the powerconnect.

I cannot figure out at all how to give the blades access to 10gb speeds.

It still thinks its connected to 1gb speeds.

Can someone please point me in the right direction.

Thanks

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DELL S6000 and GVRP

May 18, 2016, 1:51 am
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Hello,

Why GVRP create/registre Vlan on single port?

#show vlan

G   16     Active                                    G Po117(Te 0/117,Te 1/117)

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Spanning tree topology change causes network downtime

May 18, 2016, 6:32 am
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We had some serious network connection problems caused by spanning tree topology changes. Our root switch is set with the lowest STP priority and this root switch also never changes, so this setting is right.

The exact problem was that when a client connects to a client access switch, the client access switch generates a TCN which is flooded around the network.

This was only happening to one switch. The problem on this switch seems to be portfast: when I enable portfast on the client ports, I can plug-in clients and printers safely, and when I disable portfast again. Tcn's are flooded on the network and all the clients in the whole network will lose their connection for 5 to 10 seconds.

I think this is strange behavior. Although it's a best practice to enable portfast for edge ports, it should never cause any network problem, the only disadvantage should be a longer STP negotiation shouldn’t it?

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Problem IP Routing on Switch N3024P

May 18, 2016, 7:00 am
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Hi all,

I have a problem regarding ip routing in the core switch N3024P. There are several different IP segments that can not be accessed.

Example:
IP device connected in the core switch: 172.16.31.5/24

I can ping: 172.18.29.33/24 but can not ping 172.18.29.111/24 and I have enabled ip routing.

How can I do to fix/troubleshoot this problem ? Please give me all posibility and how to fix it.

Please kindly need your help.

Thanks before.

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N2000 MAC ACL - I need help on configuring only to allow mac address to pass through on a N2000

May 19, 2016, 3:24 pm
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we have a subnet that we only want certain mac address to pass through.  Is it possible to add all the mac address into the config .  if it match, move forward, if it doesn't exist deny access to the port.

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