Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [switch]

For questions about network switches, the term commonly refers to a multi-port network bridge that processes and routes data at the data link layer (layer 2) of the OSI model.

1
vote
3answers
204 views

Cisco 2960 not receiving dhcp from the router

I have a problem with Dhcp of some the Vlans. here is how my network is : I have a router ASR1001, which connects 15 switches(2960) as a ring topology. each switch has a subinterface of the router ...
1
vote
2answers
141 views

Which MAC should be used: device MAC or Interface MAC?

My L3 switch has ~30 interfaces. If you look at the output below there are two MAC addresses showing in the results of the show interface command. The hardware address is the same for all interfaces. ...
-1
votes
2answers
147 views

How to get all the device information between two devices

I've two devices: My-PC and Another-PC. The two devices are connected to a switch, which is connected to main switch with-in the same LAN. My question is: how do I get all the device information ...
-1
votes
2answers
197 views

network problems

I am having a problem with my network. I have a router (R1) connected to another router (R2) R1 is connected to a switch. R1 switch has two PC's connected to it. the PC IP's are 128.107.35.10 and 192....
2
votes
1answer
54 views

Auto smart ports macros triggers

My question is simple: I have a Catalyst 3560-X series switch and the below macro applied when i connect my laptop to the switch and it's working fine . function My_laptop_func() { if [[ $LINKUP == ...
1
vote
1answer
90 views

Switch cannot ping server

My switch won't ping my server. Both are directly connected with each other, and are in vlan 666. When I initiate a ping from my switch to my server, the switch sends ARP requests. Then the server ...
1
vote
1answer
384 views

Naming a VLAN with a space in name

I am supposed to name 2 vlans, VLAN 10, and VLAN 20. When I type Switch(config-vlan)#Name VLAN 10 ^ % Invalid input detected at '^' marker. Could I get any help please.
1
vote
1answer
329 views

Cisco ASA context OSPF configuration issue

I've two cisco ASA configured in active/active HA. ASA is connected to switch with port-channel. Switch configuration: interface Port-channel47 description ASA2 switchport mode trunk switchport ...
1
vote
1answer
4k views

Why is routing not working on my Dell N2048 switch

I am in the process of replacing some older Dell Powerconnect switches with a some Dell N2048 switches. While doing this I wanted to go ahead and segregate certain areas of my network using VLANs. ...
1
vote
1answer
224 views

Allow outgoing connections

I have an Arista switch (EOS) and I'm having trouble allowing outgoing connection from the switch to the outside. Using tcpdump I can see that no packets are being allowed. This has an impact on DNS ...
0
votes
1answer
687 views

VLAN, DHCP, WAN Configuration Over 3 Switches and 3 Networks

Switches - Cisco 2960X Take a look at the attached diagram to see what I'm trying to accomplish; I think it should be pretty self-explanatory. Switch 2 and Switch 3 I would make sure both VLAN1 and ...
-1
votes
1answer
407 views

Configuration recovery on Extreme Networks Summit 200

I need to upgrade a small network I know nothing about. The only manageable switch in an Extreme Networks Summit 200, running ExtremeWare 7.3 (from 2005!). Of course, the default admin password has ...
-1
votes
1answer
155 views

Why packets can flow through different vlans

As attached from my network diagram, may I know that why my PC under vlan 100 can retrieve ip from dhcp server and communicate to internet even though the packet going through gateway is under vlan1? ...
-1
votes
1answer
247 views

Interconnecting Switches - No Connectivity

I am trying to setup a network that consists of a workstation connected to a 2960X switch, which connects to a 3750X that connects to a 2960X switch connected to a server. I have run the web-based ...
-1
votes
1answer
151 views

What would be an optimal design for redundant switches?

I have some understanding of networking but am looking for help designing the best solution for our environment. It consists of 3 HP DL380p Hosts, 2 HP P4300 SANs, 2 HP 2910-24 AL switches for the ...
3
votes
0answers
36 views

Cisco nexus 9396 rebooted with reason xbar_client

Today my one of cisco nexus 9396PX switch got rebooted and this is what i found, based on following logs what could be wrong? We don't have Cisco support for this switch, trying to see if i can get ...
3
votes
0answers
142 views

HP 5500 JD374A Port naming convention

Hi to all :) To most of you it'll prolly sound like a very silly question to ask, however to me as a fresh network trainee the answer is unfortunately not so obvious. So, the question is whether the ...
3
votes
0answers
207 views

Hp Procurve Action ignored in download mode

From an tftp server I'm trying to import the config to startup-config using copy tftp startup-config 10.0.0.10 5006zl.cnf The switch asks for confirmation y/n and when pressing y it just aborts ...
3
votes
0answers
1k views

How do switches behave on multicast?

I am benchmarking multicast throughput of my LAN using an application that considers all the servers as group members. The network consists of homogeneous servers (S0-S9: 192.168.21.70-79) inter-...
2
votes
0answers
574 views

IPv6 Neighbor Discovery procedure with a ping example

Given the following capture (click to zoom): There are 3 routers attached to a switch. One of them pings FF02::1 (packet #2). I understand, that the other two routers have to figure out the first ...
1
vote
0answers
20 views

How can I filter the exact interface in huawei switch?

How can I filter the exact interface in huawei switch? you see when I use the include GigabitEthernet0/0/1 to filter, there will get many GigabitEthernet0/0/1* interfaces: <Z178A>dis ...
1
vote
0answers
36 views

Cisco nexus spanning-tree logging to syslog

I am trying to send my spanning-tree events to remote syslog but somehow it doesn't work, This is what i have in my config. N3K# sh run | grep logg logging level spanning-tree 7 logging server 172.29....
1
vote
0answers
41 views

Colocation network setup - 2 switches with each 1 uplink - redundant configuration question

I have a question about the network configuration when connecting 2 switches in a colocation rack via 2 uplinks (1 uplink to each switch) to 2 other switches of the datacenter itself. My topology ...
1
vote
0answers
54 views

How to keep the VRRP failover mechanism?

referring to the diagram below, we have 2 VLAN's for voice, primary route for VLAN1 (red) is the left side, and VLAN2 (green) is the right. As it stands we have a nice easy setup, where VRRP kicks ...
1
vote
0answers
271 views

Even ips pinging but odd ips not pinging

We have following network, and i have multiple host connected to TOR switches configured with public IPs. We have HSRP running on vPC switches. interface Vlan100 description *** Public VLAN *** ...
1
vote
0answers
173 views

HP ProCurve 6120XG with Cisco configuration

ProCurve 6120XG Blade Switch with Cisco trunk I have c7000 HP blade Center with ProCurve 6120XG Blade Switch and i am creating trunk to my TOR1 Cisco switch (Nexus 3064), but having issue related VLAN ...
1
vote
0answers
167 views

How does a Switch Fabric Module work internally?

I am interested how does a switch fabric module work internally. What interfaces does it use to physically connect the I/O modules on switches? Where are the CAM / MAC tables of the switch? Are ...
1
vote
0answers
56 views

How does Fabric Connect protocol work?

What are the algorithms that are used by Fabric Connect protocol/protocols to choose the best path to forward a packet? I know that Fabric Connect is used to replace the Spanning Tree Protocol that ...
1
vote
0answers
154 views

3com 5500G migration to force10 s4810

I am doing this migration with these 3com switches.So our client told me that the configuration was made for a network administrator who was fired some years ago. So I dont have any kind of ...
1
vote
0answers
332 views

Optimizing access control lists on a Cisco SG500X-48 Small Business switch

I am trying to optimize the access control list rules on a Cisco SG500X-48 Small Business switch (on Layer 3). The general aim is to regulate the traffic between two VLANs (e.g., 10 and 30) in such a ...
1
vote
0answers
147 views

Wireless guest vlan issue

I am trying to separate the traffic of a wireless controller using VLANs. I have a Cisco 4400 wireless LAN controller configured to connect to the guest VLAN on an HP ProCurve 5412zl switch. The ...
1
vote
0answers
189 views

VLAN issue in HP 5406 switch after a power outage

Last week we had a power outage. When power came back, our HP switches came back online but with a problem. A few VLANs in our HP 5406 switches did not get an IP address from DHCP server, the other ...
1
vote
0answers
797 views

Dell Switch N3048 with PowerConnect 6248

I have two Dell switches and its a classical VLAN Scenario that does not want to work. PowerConnect 6248 is connected to the outside world and from there i like to bring new subnet ( this is already ...
1
vote
0answers
587 views

PowerConnect 2808 and syslog

I have a pair of Dell PowerConnect 2808 managed switches. I am attempting to enable syslog on them, but not having any luck. I have searched the web interface, used telnet to log into the CLI ...
1
vote
0answers
2k views

Dual Internet connections in active/standby mode without BGP

hello everyone attached is my diagram in which i am facing problem as you can see i have two internet links from two ISPs in which i want failover between two ISPs without using BGP or NAT because i ...
0
votes
0answers
37 views

sflow configuration Cisco Nexus 9396PQ

We have Cisco a Nexus switch with M12PQ 12x40G GEM expansion card. Today when i enabled sflow on one of 40G interface i got following error: # sflow data-source interface e2/12 In order to enable ...
0
votes
0answers
29 views

Why does my 1921 Router not bring up its interfaces?

I have the 'no shut' command entered on both interfaces. They work when I enter the command. I copy run start 'wr' Power was cycled for the Router, Switch (3560x-24), Cable modem and AP. They were ...
0
votes
0answers
44 views

Wireshark switch ping

I understand that a switch will broadcast to all ports if it doesn't have the destined destination in its mac address table but when I analysed a scenario in wireshark I got confused at what happened. ...
0
votes
0answers
34 views

Is it possible to use FDM and TDM at the same time?

I'm learning about FDM and TDM. And I got the idea that we can use frequency division and time division at the same time, i.e. using TDM for each frequency band. Is it possible? It seems certainly ...
0
votes
0answers
114 views

Cisco 2960X stacked switches pop up ACL error messages without any ACL configured nor input

I have a few Cisco 2960X with the fiber flexstack modules, when I boot them up, I always got these message: 'Duplicate sequence number. Failed to add ace to access-list' These are brand new switches ...
0
votes
0answers
93 views

How Cisco Line Protocol works

How do Cisco Line Protocol works ? I could read this: https://www.cisco.com/c/en/us/support/docs/content-networking/keepalives/118390-technote-keepalive-00.html, about Ethernet Interfaces keepalive ...
0
votes
0answers
53 views

Block internet on a Cisco catalyst 3560 port

Good day Is there a way to block a specific port in a Cisco Catalyst 3560 switch to block the user from accessing the internet but still have full access to the internal corporate resources. The ...
0
votes
0answers
34 views

Allied Telesis AT-FS750 MAC authorization with FreeRadius

It is possible to configure mac based authorization with FreeRadius on AT-FS750? We need block device in our network with unknown MAC address. Or set limited access with specify quest VLAN.
0
votes
0answers
23 views

reset DAX switch

I have been working on configuring a network switch from DAX networks for my under-grad project. The model is DX-5048gs to be precise. The previous user has lost the credential for accessing the ...
0
votes
0answers
28 views

Tracking on a Switch

Is there a way to track on a Cisco Switch (WS-C2960-24TT-L, IOS 12.2(25r)SEE) on interface states? I would like if an interface failed, for another to fail with it (err-disable, shutdown, whichever)....