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
Join us in building a kind, collaborative learning community via our updated Code of Conduct.

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.

0
votes
0answers
19 views

Is it better to connect your WAN to Switch or to Router? [on hold]

Which option is better? Connect your WAN directly to Switch , and then to router Connect your WAN directly to Router, and then to switch If you connect WAN to your Switch, you will be able to use ...
0
votes
0answers
14 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 ...
0
votes
1answer
36 views

LACP to Fix Switch Bottleneck?

I have a bottleneck affecting traffic. There are 4 switches with each of them running a line to the next to provide internet. I haven't played around with LACP LAG too much and am wondering if the ...
0
votes
1answer
20 views

switch filter a frame

I was reading a text book, it says suppose a host A sends a frame with destination address DD-DD-DD-DD-DD-DD arrives at the switch on interface x. The switch indexes its table with the MAC address DD-...
0
votes
2answers
26 views

Which component(s) defines the link/connection speed in a network switch?

Suppose that a network switch is a xGbit switch. Which component(s) defines this speed? Is it the switch core? Is it possible to decrease the speed to < xGbits? Perhaps by using an adapter? ...
0
votes
1answer
23 views

Assigning IP Address ranges - Protocol, Best Practices [on hold]

I am looking for standard procedures when assigning a range for static ip addresses. Which are the most commonly used approaches and why. I am trying to look on the internet and this forum, however ...
1
vote
1answer
22 views

Cisco 3560 Jumbo Frame

looking for some clarification on the jumbo frame config for a cisco 3560 switch. I understand that by enabling jumbo frames, it enables it on all ports for entire switch, what happens to devices ...
0
votes
0answers
27 views

Poor VPN Performance

Initial configuraion <internet provider WAN> -- router/modem -- switch ------ clients(s) The "router/modem" DHCP handles 192.168.1.X. New configuration <internet provider WAN> -- ...
0
votes
1answer
23 views

Setting Static IP for computers under a Switch

i have a fixed Line, to which The router is connected (DHCP Enabled) Dynamic IP. I have a Switch connected to the Router. (8 Port TP Link) I have four machines connected to the switch and the count ...
1
vote
1answer
26 views

Why does the fifth port on this switch (Netgear GS305) look different? [closed]

There's a gap between port 4 and 5, and there's also an extra space in the bottom of the inside of port 5. But nothing in the documentation seems to indicate that there's anything different about port ...
3
votes
3answers
153 views

How do I Connect 4 Router with 1 Switches?

Few days ago, I got an challenge from my Senior at my workplace. Here's the representation of the topology that he gave to me : The question is, how I make each pc could ping each other? I tried IGRP ...
0
votes
0answers
20 views

Home Network Separation | Guidelines and Example [closed]

first of all, thank you for being able to ask my question here. I'm excited to soon move into my first own 4 walls, and felt like it's the right time to tackle network security and isolation. As ...
0
votes
3answers
83 views

Would it be possible to split ISP connection via Switch?

In my current setup, my ISP is directly connected to my firewall. Now I want to add a PC that I can put Static IP to test the ISP directly outside of the Firewall. would this be possible? I have 5 IP ...
0
votes
1answer
32 views

Connect to the switch console port, type the keyboard I will get messy code

I follow the Tutorial to connect a switch, use ls *usb* I can find the usb: $ ls *usb* cu.wchusbserial1410 tty.wchusbserial1410 I connect to it: screen tty.wchusbserial1410 9600 but I get the ...
2
votes
1answer
55 views

Default QoS Behavior on Catalyst 3650/3850 Running IOS XE 16.3.6

I am trying to better understand the default queuing behavior on Catalyst 3650/3860 running IOS XE 16.3.6 Denali. Is QoS enabled globally by default? Coming from working with Catalyst 2960X on IOS 15 ...
0
votes
2answers
35 views

BGP new subnet announcement

I have above scenario where I got public IP subnet got from ISP 74.100.100.0/23 and i have configured eBGP and iBGP as you can see in diagram, I have configured those Public IP in HSRP my LAN side. ...
1
vote
1answer
48 views

Which is the POS port in the picture?

Which is the POS port? I read the juniper-interface pos, there seems have no introduce of it. I have a Juniper-EX4200 interfaces picture: The front: The back: There I do not find a interface ...
2
votes
1answer
45 views

HP 6120X Blade switch QoS

I just got access of blade center and i was looking at configuration of switch which is following. I can see switch has already QoS configured, I am not very expert in QoS so trying to understand ...
3
votes
1answer
54 views

Legacy Network, Adding new VLANs

I've recently been tasked with cleaning up an old network in where no passwords were provided, I was able to get in and look at the config. I've decided to replace 3 switches and add some new vlans in ...
6
votes
3answers
130 views

How to connect 3rd party SFP to the cisco switch?

I am trying to connect "sfp-1ge-fe-e-t" sfp module to CISCO Catalyst C3560G-48TS switch. When i pluged module to the port and following error was shown: %GBIC_SECURITY_CRYPT-4-VN_DATA_CRC_ERROR: ...
2
votes
1answer
56 views

Packet vs Circuit switching

I have a 1Mb/s link each user uses 100Kb/s when active. With 10 user active 10% of the time, I can have 10 users in a circuit switched environment. Packet switching with 35 users, probability > 10 ...
1
vote
3answers
63 views

how to do inter vlan for same subnet

I configure two same subnet network(ip:192.168.0.2 & ip:192.168.0.3) into VLAN...so they wont communicating with each other...but now i want them to communicate with each other... For that i ...
2
votes
1answer
49 views

End-to-End delay

I’m working through questions from computer networking top down approach and was hoping to get some clarity on the end-to-end delay calculation. At this stage we are not considering processing, ...
5
votes
2answers
103 views

Layer3 vs Layer2 LACP

We have ISP link 4x10G LACP Layer2 and now we are upgrade to to 8x10G LACP, currently i have created VLAN interface to terminate that link because it L2 Now i have option to decide to go with L3 or ...
1
vote
0answers
31 views

Not constant ping to cisco switch [closed]

I have LAN made up from CISCO 2960 switches. Topology is Star. One core switch and others are on floors. Sometimes ping is lost to one of the switches which is in server room. There is no loop, we ...
2
votes
2answers
26 views

What happens to traffic when switch monitor port is congested?

Client has to record their customer calls. A previous engineer setup a HP 2610 100Mbit switch with port 2 as the monitor port and 1, 3-48 as monitored ports. The ports are for PoE phones and the ...
0
votes
1answer
32 views

Frame transfer from one switch to another configured with VLANS

Hi, My question is related to the Vlan. And this question would consist of 2 parts. 1)Would Switch 1 know all the devices present in Vlan 2 or Vlan 3, including the ones present in the Switch 2. ...
2
votes
1answer
73 views

Multicast flooding network ProCurve Switch 2520G

Switch: ProCurve Switch 2520G-8-PoE Scenario: Multicast is flooded onto the network Having multicast flooded makes it so TV is stuttering and pixelating. I do on my ProCurve have IGMP and Querier ...
2
votes
1answer
137 views

Cisco Nexus vPC LACP bonding with server issue

I am configuring vPC end to end till my server to get more bandwidth, and following is my scenario I am seeing one strange thing which is i configured vPC on N3k switch and then i configured my ...
0
votes
1answer
61 views

Can a VLAN have hosts with IP addresses outside it Subnet IP range scope?

I have 3 entities in my network. A server,switch and an appliance which acts as a DHCP/PXE server. When the server starts up, the DHCP server has to PXE boot the server. A seperate VLAN(1234) is ...
3
votes
2answers
94 views

What is the best to simulate an RJ45 cable failure without changing switch configuration or removing the cable?

I am looking at an automation element for a training environment. We would like to be able to fail a cable without doing a shutdown on the interface or having an engineer physically remove the cable ...
0
votes
1answer
80 views

How to change HSRP version 1 to 2 without downtime?

We have running HSRP in production but its running on version 1 now i want to change it to version 2 so is there a way to do without any downtime or disturb live traffic?
3
votes
1answer
102 views

vPC with HSRP strange arp issue

I have following scenario with vPC and HSRP (version 1) configuration. I am seeing very strange issue, my host configured for bond + vlan and my bonding mode is active-backup, I have only VLAN 100 ...
1
vote
2answers
62 views

Unable to ping internet from switch

Router internet interface Fastethernet0/0 192.168.0.17 (ip nat outside) internal interface 192.168.1.1 (ip nat inside) able to ping 8.8.8.8 from router Interface IP-Address OK?...
2
votes
1answer
71 views

Why switch has records in mac-table when i just set ip address to the hosts which connected to the switch?

I created a new switch and connected to two hosts in GNS3.Like this: Host1--->LS<---Host2, i think the mac-table in the switch should be empty before i sent data between two hosts. But when i just ...
1
vote
0answers
50 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 *** ...
5
votes
5answers
2k views

Does a Layer 3 switch become a Layer 4 device when telnetting?

In order to Telnet to a switch (Layer 2) we create an SVI, thus a layer 3 point of contact is made. The switch inspects each packet sent from the remote client and responds to it so that it gets ...
1
vote
1answer
23 views

SNMP returns strange “bits sent/received” values on a particular port, why?

I have a HP V1910 Switch in my office. I have set up monitoring via SNMP on my local Zabbix server, and everything looks really good on almost all ports (for example, when I use iperf to test ...
2
votes
1answer
40 views

LAN side 1Gb link showing WAN 4Mbps throughput in SNMP

I am a-bit confused here. I have a FW connected to L2 switch then to an ISP router. My ISP link has a 4Mb capped on the egress. [My FW] <-1Gb link-> [p0 L2 Switch p1] <-1Gb link-> [ISP ...
1
vote
0answers
63 views

Frequent Internet Disconnection

Hello everyone! I am relatively new to this forum, and wanted to get some useful feedbacks and resolution from "network-PROs" on my problem.. I have a network with a main router connected to the ...
2
votes
2answers
84 views

BGP source base routing question

This question is little convoluted to explain but i will try my best, I have following scenario. I have one ISP and i am getting 2x40G drops which you can see in diagram Link-A and Link-B (Both ...
0
votes
1answer
64 views

Dell 5524 Switch ports going up and down constantly

We have bought a two new Dell PowerConnect 5524 switch and stacked them. Switches are brand new and working in a datacenter. Edit (Additional Information): These switches are brand new and there is ...
0
votes
1answer
20 views

Management of a switch cisco IE-2000-16PTC-G-L

hello I have a problem with the management of a switch cisco IE-2000-16PTC-G-L, I have all the services working but I have no way to telnet to the switch, this problem is solved by restarting the same,...
0
votes
0answers
9 views

How to secure management wired network for public use (Mikrotik + UBNT + Zyxel) [duplicate]

In a network there is a router from Mikrotik, switches are ZyXEL GS1900-24HP and the access points are Unifi UAP AC-LR. I have configured three VLAN's: public, staff and management. All the access ...
1
vote
1answer
109 views

Connecting SG220 switches

I have to connect two SG220 series switches. On the first switch (S1) I have created 3 vlan (vlan10, vlan20 and vlan30). On one of the port I connected Mikrotik router with the same vlans and DHCP ...
0
votes
3answers
64 views

Connecting non-redundant switches to stacked switches

We have stacked Force10 MXL switches with very basic setup. However we want to extend our network with Ceph using non-redundant (or stacked) switches. What we aim to create a network like this; NRS: ...
0
votes
2answers
54 views

Cisco 220 Switch fail over

we have a Cisco 220 Switch, how to fail over this switch, in other words how to have another switch that activates when the first dies? Thanks !!
1
vote
2answers
53 views

How does a switch know how to route ping packets?

i tried to browse all available answers on this subject, but it's still not clear to me what a switch can or can't do. I understand that when a host sends out a ping command, for instance ping 192....
0
votes
0answers
45 views

Dhcp server not working after server bootup when plugged into managed switch

I have very simple network with one DHCP pool. I've installed ISC dhcp on ubuntu linux and everything works fine and fast on simple unmanaged switch. After connect server to managed switch TP-Link ...
0
votes
1answer
44 views

AWS direct connect with Cisco ASA redendency

We have following scenario currently and BLUE link is active and running, now i am going to get second link for redendency which is right side of diagram. As you can see currently i have VLAN 9 (...