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.

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Unable to reach a device on another net while having routes

I'm not sure what I'm doing wrong and would therefore need some guidance. The goal is to be able to have a SSH connection between: PC -> C On PC I have created a route route add 192.168.50.0 mask ...
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52 views

Vlaning issue Cisco 3560 Switch

I'm trying to connect a door intercom to fastethernet 0/1 and then 8 users connect to fe 0/2-fe 0/9 and give each user access to the first port (0/1) without letting them access each other. I have ...
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1answer
70 views

CISCO IOS's feature Secure Shell Version 2 Enhancements for RSA Keys

I have a switch C3750V2-48PS with IOS ver. 12.2(55)SE5. I wanted to copy to it public key for the ssh client but I do not have following command available Switch#configure terminal Switch(config)#ip ...
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3answers
1k views

How to debug L1 Auto negotiation issues?

One of our Linux hosts has started switching its gears recently. While checking the interface speed, I could see that the interface has switched down to 10Mbps. The NIC and Switch are capable of 1G ...
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1answer
43 views

Linux network bonding/teaming

I have two linux servers with two NICs each and two unmanaged switches. This is my preferred design: Server A - eth0 -> Switch 1 Server A - eth1 -> Switch 2 Server B - eth0 -> Switch 1 ...
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1answer
77 views

Managed switch uplink without “no switchport”

Say you have a L3 switch routing between VLANs 10, 20, and 30, and you need to uplink the switch to a router for the VLANs to get to the rest of the network. The VLANs don't traverse between sites. I ...
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1answer
146 views

Optimal network topology for diskless setup [closed]

I need advice on which of the following options would be best, plus their pros and cons. I already have an idea but I need expert opinions and experience to validate if these are even possible and if ...
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1answer
123 views

trunk between two switches on different network

I have a trunk setup between the 172.16.64.2 and 172.16.128.2 switches, but I can't ping them. I can only ping their default gateways which is their .1 on the router. What am I doing wrong?
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109 views

Dynamic VLAN assignment

I have a Juniper SRX550 router. Port 0/0/0 is Internet. 0/0/2 is 172.16.64.1/18, and 0/0/3 is 172.16.128.1/18. I also have the Juniper to do DHCP for the two networks. Cable goes from 0/0/2 to ...
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1answer
73 views

Access list per port for 48-port switches

We have 3750g, 3750e, 4948, 2960 series Cisco switches and all of them are 48 ports so we want to create one standard access list per port switch and in every ACL we permit 5-6 prefix (short prefixes ...
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34 views

Access switch (for configuration) remotly using telnet

i know that if i want to access to switch remotly (for configuration) using TELNET from a network where the switch dosen't belong using ip default-gateway. but what if i want to access to ths switch ...
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408 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.
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36 views

do switch Layer 2 sends frame to all the PCs that are connected to it

here is an example to explain my incomprehension: PING: PC1 -----> SWITCH -------> PC2. i know that when a PC1 send frame to switch, the switch will add the mac address to his mac address table, then ...
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1answer
99 views

How ip access-list work on a switch?

Switch does look at layer 2 information - Ethernet payload, L3 switch look at IP payload too, if need. And the question is: How feature like this "ip access-list extended tcp deny host 1.2.3.4 any ...
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1answer
29 views

Can we call the received data(after combination) as `message`?

In the message transmission, the message A is a Word document(20M). When A transfer, it will be divide to many packets, every package added a header for marking as source address and destination ...
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1answer
70 views

What hardware do I need to assign IPs based on port?

Similar (but different) question: Assign an IP address based on switch port I regularly need to test our hardware products. Usually that consists of having ~50 devices sitting on a bench for some ...
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3answers
2k views

Is there a performance difference between a managed an unmanaged network switch?

Is there a tangible difference in speed/latency between a managed and unmanaged network switch?
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44 views

Can Multicasting be duplicated by broadcasting on a subnet?

Is there any functional difference between: A) Broadcasting to a range of addresses B) Putting the range of addresses into a subnet and broadcasting to that subnet Would it matter if there was a ...
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2answers
82 views

How does a Layer 2 Switch know which port is a neighboring switch port and which port is connected to a host?

I want to know what is the mechanism behind a switch, so that it understands which of its ports are connected to a host (end device), and which of them are connected to another switch? Imagine trunk ...
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1answer
162 views

Understanding IP multicast in linux [closed]

My ultimate goal is to setup IGMP snooping on a linux machine using netfilter hooks. This is for exploratory purposes to understand IGMP protocol. The topology we are using is as follows: | ...
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3answers
371 views

Why does it say, that a Switch can segregate the collision domain?

In general, the Ethernet Switch use RJ-45 link to connect the Hosts and the Switch uses Store and Forward mode. So, why is there a saying: Switch can segregate the collision domain I thought ...
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1answer
25 views

Where does the VLAN's gateway location

Where is the gateway IP address of the VLAN? We know the Switch can divide the VLAN, such as it can divide the 103.19.1.0/24 to 103.19.1.0/25 and 103.19.1.128/25. if the 103.19.1.0/25's gateway IP ...
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1answer
150 views

Layer 3 switch model 3950 encapsulation

How to ensure trunk link in the switch are using dot1q encapsulation, when dtp (dynamic trunking protocol) is enable along with vtp. I know when manually setting trunk links, you can force the trunk ...
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2answers
573 views

When doing 802.1X port authentication, how does the switch know how reach the authentication server?

So, while I get the supplicant-authenticator-authentication server structure (for the most part), the part that bugs me is the step when the switch starts communicating with the authentication server; ...
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3answers
231 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 ...
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1answer
386 views

Cisco nexus 3048 SFP validation failed

I have cisco Nexus 3048TP switch (48x1G + 4x10G) Hardware cisco Nexus 3048 Chassis ("48x1GE + 4x10G Supervisor") Intel(R) Celeron(R) CPU P4505 @ 1.87GHz with 3665240 kB of memory. ...
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1answer
53 views

Configuration file of switches format

Do we need different config files for each category [aaa, bfd, ptp, lldp, vlan etc] for deployment or can there be a single config file that contains all [aaa, bfd, ptp, lldp, vlan etc] and do they ...
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1answer
243 views

What do exclamation '!' and period '.' mean in a switch config file

what do the ! and . mean in switch config files? Current configuration: 1363 bytes ! version 12.1 no service pad service timestamps debug uptime service timestamps log uptime no service password-...
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1answer
46 views

Whether the network between Routers are circuit-switched network, and the network connected by Switches are packet-switched network?

Whether the network between Routers are circuit-switched network? and the network connected by Switches are packet-switched network? EDIT-01 I mean if the Net1 can be regarded as circuit-switched ...
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1answer
358 views

Is there a way to “Pass through” a MAC address on a Cisco Switch?

We have two systems connected together, and the end system (system 2) relies on differentiating packets via MAC address from system 1 (it has two routes). For testing purposes, we want to put a ...
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1answer
41 views

What are the differences between a basic configuration and a full configuration of a network device?

When someone is talking about a basic/base configuration of a network device, does this mean the startup configuration file? And when a full configuration is referenced how is it different from a ...
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1answer
126 views

Can i implement BGP flowspec

This question is for general information about BGP flowspec, Can i implement BGP flowspec to stop DDoS? RTBH isn't what we want because it blackholing all traffic, we want RTBH at Layer 4 level where ...
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1answer
39 views

Unconnected cable in a switch

A cable plugged into a switch but unconnected on the other end, might lead to any problem in a "noisy" environment (industrial)? It's short, 50 cm, but there are motors, inverters, power supplies ...
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1answer
466 views

Can all ports on nowadays switches act as uplink ports? [closed]

I basically know nothing about networks (I just learned what switch meant yesterday), and English is not my first language but I hope I can make my question clear. So I just moved into a new house, ...
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2answers
875 views

How to check if switch is ipv6 fully compatible

We will move to IPv6 in the next months and I have a lot of switches and routers and I want to discard IPv6 non-compatible or not fully compatible devices. What kind of standar I will need to check ...
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3answers
63 views

Management switch as a medium only

The main goal is to guarantee communication between CE switches without any PE reconfiguration. Interface GE0/0/1, GE0/0/2, GE0/0/3, GE0/0/4 will be connected to Customer switches. Customer decide ...
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8 views

Using Router instead of switch to isolate traffic [duplicate]

I was reading my textbook which says that : Although the hierarchy localizes group traffic to within a single switch, broadcast traffic (e.g., frames carrying ARP and DHCP messages or frames whose ...
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1answer
76 views

Some users/routers often can't access the internet [closed]

There are times that some users can't access the internet. Usually this happens with the routers with DHCP enabled, they alternately can't access internet. I suspect that the main router is faulty. I ...
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1answer
205 views

Help this problem with Dhcp Server with two switches

I will try to explain my problem. I am trying that Switch 1 can give dhcp for pcs but i cannot, in Switch 0 I can give dhcp server in the pcs. sorry for my bad english ROUTER ! version 15.1 no ...
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2answers
64 views

Why don't switch MAC addresses conflict

Switches apparently have a base MAC and self-generate MAC value for each port from that base. If a company that makes both switches and processor boards builds a switch and assigns it MAC "N" and ...
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2answers
37 views

Network switch simultaneous client-to-client speeds?

If I have a 24-port gigabit switch with no uplink, and the odd-numbered downlink clients are transferring data to the even-numbered downlink clients, will I theoretically have (12 x 1 gigabit) ...
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1answer
318 views

Is it possible to remove/block a EIGRP neighbors connection via Switch?

I have a 4 routers that connected each other via an multilayer switch. Is it possible to remove/block an EIGRP neighbors via Switch? For example, I have a topology like this : I wanted to remove ...
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1answer
349 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 ...
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1answer
64 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 ...
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1answer
32 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-...
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2answers
43 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? ...
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1answer
45 views

Assigning IP Address ranges - Protocol, Best Practices [closed]

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 ...
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1answer
83 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 ...
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1answer
965 views

Setting Static IP for computers under a Switch [closed]

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 ...
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1answer
109 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 ...