Stack Exchange Network

Stack Exchange network consists of 174 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
0answers
20 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 ...
0
votes
1answer
31 views

Why doesn't Ethernet protocol support switch fabric topology?

While learning about Fibre Channel and SAN, I found the following information on IBM Knowledge Center: A switched fabric is a fibre channel topology in which individual node ports are ...
0
votes
1answer
12 views

Cisco/Meraki switch SFP compatibility and dual link

Our company wants to connect two different floors together about 150-200 feet apart. I was thinking fiber would be the best option for this but I don't have much experience so I would like to see if ...
1
vote
1answer
96 views

QOS police vs bandwidth - is this configuration wrong?

I understand bandwidth in QOS is use to guarantee a minimum bandwidth I understand police in QOS is to set a limit to the maximum bandwidth. class test_out police **1608000** 50000 100000 conform-...
0
votes
0answers
15 views

Can't Seem to Resolve Static DNS Issue [on hold]

I am statically configuring IP address, subnet mask, default gateway and primary and secondary DNS servers on my host, which is a Windows 10 PC. Everything is working perfectly except the DNS ...
2
votes
1answer
33 views

WISP Network Edge Device - Router vs Switch

I am faced with an issue right now working for a small rural WISP. We have roughly 250 wireless customers throughout our area using Ubiquiti radios. Our main fiber drop comes in from a larger ISP on ...
-3
votes
0answers
26 views

THRESHOLD_VIOLATION [closed]

3d16h: %SFF8472-5-THRESHOLD_VIOLATION: Te4/2: Tx power low alarm; Operating value: -40.0 dBm, Threshold value: -11.3 dBm. Dec 1 10:08:00: (Suppressed 3297 times)Dup Packet Fail for Sw Port.
1
vote
1answer
19 views

Quanta switch not resolving addresses

I've got this brand new Quanta T3048. I've configured the VLANs we need but it came to my attention that the switch won't resolve any address even though I've set it (according to the configuration ...
0
votes
0answers
17 views

SNMP Hex to normal string for VLANS and ports [closed]

I`m searching possibility to get untagged ports from ZyXEL switch SNMP Problem is that Q-BRIDGE-MIB dot1qVlanStaticEgressPorts,1.3.6.1.2.1.17.7.1.4.3.1.2 return HEX... that must be decoded. Do ...
4
votes
1answer
58 views

Does QSFP+ require 4 fibers?

I am currently designing a network, and there are 2 fibers between 2 switches. Can I use a 40Gbit QSFP+ module to achieve this speed or is 10Gbit SFP the best possible without adding more fibers?
0
votes
0answers
7 views

Switched ISPs and no longer have internet access…basic configuration for managed switch? [closed]

Setup: ISPs router/modem/wifi << netvanta 1531p (managed layer 3 switch) << PC What I do know? Internet was working for devices on the managed switch prior to switching ISPs. When I ...
1
vote
1answer
108 views

When are Native VLANs used? Are there times when a Native VLAN will never be used?

This is probably a simple one, but I am very new to VLANs. I'd like to avoid using VLAN 1 as well as gain a better understanding of when native VLANs come into play when setting up a switch. On ...
0
votes
1answer
10 views

UniFi Switch US 8-60w with a UniFi AP-AC-LR

I've bought myself a UniFi AP-AC-LR and a UniFi Switch US 8-60w. Are those two devices compatible to use power over ethernet cable to link them? With kind regards
1
vote
1answer
31 views

Etherchannel configuration on two differents routers and 1 L3 switch

Is it possible to configure an aggregation etherchannel between two routers and one L3 switch, means that : the one link in : R1 <-> L3 Switch1 , and the second aggregation link in : R2 <-> L3 ...
1
vote
1answer
48 views

VLAN forwarding in cisco

We have a Cisco 3750X (L3) as a core switch and 10 Cisco SG-300 (L2), each Switch is in a separate VLAN (include core switch) now I want to define VLAN forwarding rule on my core switch, so all ...
2
votes
1answer
89 views

single command to gather mac addresses of connected devices to switch

I've connected multiple PCs to a 2960 switch and then entered privilege mode and entered : show mac-address-table but the table is empty. Then I pinged the broadcast address from one of the PCs: ping ...
2
votes
1answer
30 views

Cascading a switch interface to another switch

We have a service provider switch which has an interface that we use to connect to other users over. We have been advised by the SP that we can use this interface how we wish (i.e. feed it into a ...
1
vote
1answer
20 views

ISP Failover On A Converged Network

We have our fiber providor as our primary ISP. We have comcast as our secondary ISP and our Voip providor. We can setup the failover between the two ISPs. We also have 19 voip phones that are on a ...
4
votes
2answers
119 views

spanning tree RootGuard question on vPC switches

I have following diagram and two distribution switch connected back to back over vPC Related spanning-tree question is it ok to use RootGuard on both distribution switch where access switch is ...
1
vote
1answer
34 views

Inter Vlan on L3 switch

I do an inter-vlan L3 switch lab on Eve-ng emulator. The topology like below And this is output from some show command at the L3 switch: Building configuration... Current configuration : 1422 ...
1
vote
1answer
47 views

How to use console serial cable for cisco SG300 switch?

I have cisco SG300-28P series managed switch. I'd like to change default ip which is (192.168.1.254). When I am trying to connect the switch using ethernet cable it is shown me there is no access, ...
1
vote
2answers
38 views

ASA5520 to 2960X setup

I am setting up a new remote office setup with an ASA5520 to a Cisco 2960X switch. I subinterfaced the the ASA inside to allow the Wired and Wireless subnets. On the 2960 I created a Vlan 100 for the ...
1
vote
1answer
29 views

Half duplex setting switch forwarding frame collides with host forwarding frame

So my question is regarding half duplex switches connected to hosts. Consider a case where a switch is connected to a host by a single link. In an event where a switch decides to forward a frame to ...
1
vote
2answers
26 views

IP Domain-name on aggregation layer switch

Hi I was trying to generate ssh key for a switch I read that , ssh key is generated as a combination of hostname and domain-name I created a domain name like test But doubt is , why isn't the ...
1
vote
1answer
48 views

Help with small office setup - Cisco SG350 28 port switch

I have very limited knowledge in Cisco IOS but in a crucial state to setup up a small office network. I have bought 2 Cisco SG350 28 port Layer 3 switch, Switches should be enabled with VLAN and VTP. ...
1
vote
1answer
56 views

Configuring multiple subnets with switch connected to single router interface

I have a design like this But I'm receiving a lot of mismatch errors and it doesn't work at all. I tried to ping 10.0.0.1 to no avail. I'm trying to configure the vlans on the switch 1 this way (...
0
votes
1answer
40 views

What's the difference between Router port and Switch port? [closed]

What's the difference between Router port and Switch port?
3
votes
1answer
47 views

Set password of a Switch to “C?1sc0” using CLI in Cisco Packet Tracer

I have been asked to set the password of a Switch to "C?1sc0" in Cisco Packet Tracer. The problem is that when i type "?" in CLI it prints out: Router(config)#enable password ? 7 Specifies a ...
3
votes
1answer
36 views

How come a PC can connect to a Switch using Crossover copper, and sometimes a Straight-Through Copper?

How come a PC can connect to a Switch using Crossover copper, and sometimes a Straight-Through Copper? The below topology is in my Cisco Network in Packet Tracer.
3
votes
1answer
30 views

Can I setup a WLAN with just a Access Point and Switch

Is it possible to setup a WLAN with an Access Point and a Switch only? I would like to connect wireless devices wireless to the access point which is connected to the switch. Then, have another ...
1
vote
2answers
51 views

Putty Console printing weird Symbols?

So I just installed a new serial port on my PC so I can connect to my switch via console, and while connecting to the switch, I have a connection established but it prints all these weird symbols. ...
0
votes
1answer
57 views

Why are there IP collisions in my network? [closed]

So I have a switch connected to ethernet cable which has a static IP address configured on it for IPv4 / v6. there are 3 IPv4 static addresses on its subnet. I have 2 Anritsu callboxes connected to ...
2
votes
1answer
28 views

Connect two VLANs on an NE1032 Lenovo L3 Switch

I just got a new Lenovo ThinkSwitch NE1032 with some 1G sfp. I have already created two VLANs called FE and BE that have the following IDs: 2,3. I have managed to assign an IP subnet to both of them, ...
0
votes
0answers
16 views

Hp Aruba 2530 IGMP not filterign properly [duplicate]

I have problem with igmp for Aruba 2530 48G. I have Multicast Headend connected to Core switch Cisco 2960 - this switch is connected to Aruba SW1 and from aruba SW i have connected 4 switches via ...
0
votes
1answer
45 views

DSCP re-marking on Cisco Switch

I've followed the commands in this post: DSCP trust boundary policy-map MARKDOWN class class-default set dscp ef Interface Config: interface gig 0/1 service-policy input MARKDOWN The ...
6
votes
2answers
538 views

Posible to connect VLAN switch through dumb switch?

Is it possible to connect a VLAN switch into a dumb switch ? The router will know how to reach network connected by a VLAN through the dumb switch please ? No edge effect ? By example, a schema of ...
1
vote
1answer
33 views

How to avoid microbursts causing drops?

I have a network issue that has to do with microbursts. I will first tell a bit about the network: There are 4 Aruba/HP ProCurve switches. 1 Core switch and 3 downstream switches. All connections in ...
1
vote
1answer
28 views

Confused about switch configuration with 2 VLANs, and next hop route?

I have an Arista switch I'm trying to setup for learning. The router is a Netgate SG-3100 running pfSense 2.4.5. I have two VLANs setup: VLAN 22 - for normal browsing. Using the 10.0.22.0/24 subnet ...
2
votes
1answer
23 views

When the data pass the Switch in port can represent cost value?

The snapshot is a tutorial of Switch. You see the bellow snapshot, from the ROOT SW1 node to SW3, there are two path: the author says the the path1(left side path) cost is 0 + SW3-in-port. the path2(...
2
votes
3answers
54 views

Are the Switches not direct connect to the root-bridge need select root port in the STP circuit?

In the STP circuit like bellow, will the Router2 select a root port? or just the Router1 and Router3 select root port? in a tutorial it says "all the non-root bridge node will select a root-port, ...
6
votes
0answers
63 views

Can a Firewall be deployed on a L2 device defined Network?

I have just started my new job as a network engineer and have come across an unusual request I have an L2 network defined, the LAN is behind a Layer 2 switch, which is then connected to the WAN/MPLS ...
2
votes
1answer
37 views

Traffic policing on a switch

Is this too much to ask from a Cisco switch.. Being able to limit traffic on a per IP basis on a single interface. e.g. 192.168.1.12 = 500kbps 192.168.1.30 = 200kbps I know traffic policing is ...
2
votes
2answers
53 views

Does Switch need its own MAC address?

I saw a post say Switch do not need its MAC address, unless it's an administrable Switch for managing. but I found the spanning-tree protocol need a MAC address of Switch to form STP Root Bridge ID. ...
1
vote
1answer
41 views

What's the `CPU Interface` of Switch?

What's the CPU Interface of Switch? in the 2960-24TT Switch, there is a CPU Interface in it. Switch#show interfaces | begin CPU Hardware is CPU Interface, address is 0002.1669.5897 (bia 0002.1669....
1
vote
1answer
30 views

How can I config multi switch port efficiently?

I have a Cisco 2960-24TT Switch, no I want to shutdown all the switch port, I have to enter the interface then execute no shutdown and exit it then re-do this steps. how can I config multi switch port ...
4
votes
1answer
30 views

Is it a protocol of flooding to find the MAC address?

Is it a protocol of flooding to find the MAC address? As we know, if the switch can not find a MAC address, it will flooding to every switchport except the entry port to find the corresponding MAC ...
4
votes
2answers
59 views

Does 802.1Q protocol will remove the VLAN tag in the received place?

Does 802.1Q protocol will remove the VLAN tag in the received place? Such as the VLAN 10 trough 802.1Q protocol to pass frames. the 802.1Q will add 802.1q header(tag) and recalculate CRC/FCS like ...
7
votes
2answers
46 views

Is 2 devices connected via a switch equivalent to those 2 devices connected directly?

If just considering the basic functionality of a switch, can I say that 2 devices connected (via ethernet cable) to a switch, is functionally equivalent to having those 2 devices directly connected to ...
0
votes
3answers
47 views

How does a switch differentiate VLANs internally? [closed]

In a simple topology of a single switch with two Access ports configured, for example fa0/1 on VLAN 10 and fa0/2 on VLAN 20, how does a switch know not to send broadcasts between these vlans if they ...
1
vote
1answer
27 views

The Switches can not get through by both FastEthernet switchport.

I have two Switch 2950T-24 in my Cisco Packet Tracer, and I want connect their FastEthernet port. But I wait a long time the triangular symbol do not turn green.