Questions tagged [switching]

For questions related to traffic switching and troubleshooting the traffic switching process.

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35 views

DHCP Help 3560-CX + Aruba AP515

The problem VLAN 100 is not assigning IP address to the SSID Guest from the AP, but Aruba is Tagging the SSID to be VLAN 100. How do I get the Switch to assign the DHCP? On the switch, it seems to ...
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0answers
13 views

Network switches and router integration [closed]

I have more than 70 users in my network. I just need to give them internet access. 56 will be in lab are their working nature will be same. Rest of the user belongs to HR and other departments and can ...
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3answers
9k views

Why do switches and access points have ip addresses?

i am newbie in networking. While working on the network i have seen that switches and wifi access points do contain the ip addresses. One reason for them to have the ip address is that we can manage ...
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0answers
18 views

How do switches learn the neighbour MAC address? [duplicate]

According to the CCNA Official Guide a switch learns the new MAC address by checking the source MAC address of a new frame. Here is the quote: Switches build the address table by listening to ...
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1answer
50 views

VLAN not working in ComNet switch [closed]

I'm trying to configure VLANs with 3 switches ComNet (2- CNGE2FE8MSPOE + 1- CWGE26FX2TX24MSPOE) and it's not working as I expect. It's the first time that I work with VLAN and I don't know If I didn'...
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1answer
39 views

What might be the potential impact on increasing or decreasing MTU size of packet in network

i am looking eagerly to know the potential impact on network while and after changing maximum transmissions (MTU ) from 1500 default value to any other value .
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1answer
44 views

Mac Instability in STP after topology change!

So I'm learning about STP and I recently been taught that when the topology is changed due to direct or indirect Link failure a Mac Instability could occur, So I was wondering, If the blocked port is ...
4
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2answers
3k views

Communication between a Switch and Router?

When a computer, Computer A, wants to communicate with Computer B, it (Computer A) will use MAC and IP addresses. It will send the packet of information to Switch, which, based upon the MAC ...
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2answers
50 views

I Cannot Ping Switch to Device, but can ping Device to Device

I'm currently troubleshooting a network i built and I'm having an issue with ping connectivity, i have set up DHCP and DNS and my end devices can get IP's from DHCP as well as i have intervlan ...
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2answers
21 views

Does circuit switching know any information about the networks topology? [duplicate]

I've been stuck with this question for a while. I'm aware of the fact that in circuit switching all the packets use the same path, but does circuit switching need to know the network structure in ...
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2answers
1k views

How do I enable port security on Cisco switch?

I have a Cisco switch model 3500 series 48 port. I need to enable port security on this switch. Could you tell me the configuration commands to apply this policy?
2
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5answers
5k views

Best practice for connecting router to switch? (re: VLANs and multiple ports)

When using multiple VLANs, what is the best practice for connecting a router to a switch? For example, I can use one single port (and one cable) between the switch and router and set it up as a VLAN ...
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6answers
72k views

Ping between different subnet across a link

Would Ping from PC1 to PC2 work? No other L3 ports on these 2 devices and its forwarding table does not contain any entry apart from the one created due to configured interfaces. ARP table is empty. ...
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2answers
967 views

Why does a switch have different MAC addresses?

I am working with Cisco Nexus 3000 switch. I was under the assumption that a switch will always have a single MAC address but when I ran the following command, it displayed two different MAC addresses ...
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0answers
14 views

ISDN, DSL, Circuit Switching and Package Switching [duplicate]

I need a bit of help to clarify the above-mentioned terms. From my reading, I can see that both ISDN and DSL are used over telephone copper lines. However, ISDN is associated with circuit switching ...
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3answers
1k views

Can VLANs with same no but on different switches communicate with each other?

If i have a VLAN (say VLAN 10) on switch 1 and again a VLAN 10 on switch 2. Can the hosts on these VLANS communicate with each other?
5
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3answers
60k views

How can hosts on two different VLANs communicate?

It is clear that hosts on two different VLANs can't directly communicate on a single switch, but how do they communicate to each other at all? Do they use a router? How does it work?
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2answers
14k 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, ...
2
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5answers
6k views

How can I change the IP address of a running switch (HP 2510)?

The switch is running at a remote location and is connected to a network with the IP address 10.10.10.10. How can I change the IP address to 10.10.10.11 via telnet? The switch has to stay reachable ...
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3answers
601 views

How can i find which cisco switch port is connnected to specific port of Fortigate?

there is any way to find that which switch port connected to mgmt port of fortigate? for example can i enable lldp on Cisco switch and Fortigate together? Fortigate 1500D (version 5.6.2) and switch is ...
2
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2answers
312 views

How do computers send switches packets, if switches don't have IP or MAC addresses?

I am new to networking, so please excuse me if I am saying stupid stuff. From my understanding, PCs are sending packets to switches, which then decide which physical port to forward that packet to. ...
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4answers
286 views

How to Control Routing Table from exceeding its size theoretically or practically

I understand that switches learn from incoming traffic and thus builds its switching table. Does that also apply for routers? If so, how routing table can avoid increasing the routing table size since ...
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2answers
306 views

Forwarding communication between two ports on switch

I have an industrial network with ring topology, consisting of a number of dumb switches and one manageable switch (Siemens OSM 62) acting like a supervisor. But now I would like to add new switch to ...
2
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2answers
45 views

How to distinguish a traffic that belongs to specific service

Suppose I have a server running different services, say Email exchange, storage space, web server, and SQL database. Assuming this server is bounded with one IP address and one NIC card, how can I ...
4
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4answers
6k views

Layer 3 Switch Routing vs Router on a Stick

CORE: Dell N4032 (6.3.0.18) Access: Dell N2048 (6.3.1.13) We are in the process of setting up a serviced office that will serve multiple businesses. Each "customer" will naturally be on their own ...
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3answers
30k views

Why can't devices in different subnets talk with each other?

I know that the layer 2 doesn't understand IP, and the broadcast domain is same. Why can't devices talk, how does it happen?
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3answers
2k views

What is the proper switch configuration for the switch that is connected directly to ISP source?

The Question: What is the proper configuration for the L3 switch to be allowed to assign public IPs for the firewalls? I guess All I need is that the switch L3 act as a layer 2 switch...Right? ...
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2answers
80 views

If I configure a default route for a switch, will it override the routing of the existing traffic?

In this instance it's a Extreme managed switch, but I guess this would apply on others too. Basically, I noticed we couldn't ping the switch, and eventually found this was down to the fact the switch ...
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2answers
881 views

How do two routers (from two different entities) talk to each other?

Let's say there are two routers and they are neighbors, but administered by two different organizations/entities, running two different routing protocols. How are they able talk to each other?
2
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1answer
92 views

In RSTP, where all switches generate their own BPDUs, are they limited to forwarding them only on designated ports? (like in classic STP)

I recently learnt a rule in STP: only Designated ports forward BPDUs. However, I'm not sure about this in RSTP since ALL switches generate their own BPDUs every few seconds. So, in a certain LAN ...
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2answers
96 views

Do DSLAM and OLT function like a switch?

Let's say for example we have the following hypothetical topology: In each network, can each user communicate with each other? For example, can User 1 ping User 2?
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4answers
4k views

One VLAN on two switches

I'm trying to understand the specifics of trunking a VLAN on two switches. Say I have two switches, both hosting half of VLAN 3. Switch 1: Ports 0-5 on VLAN 3, Port 6 is Trunk Switch 2: Ports 0-5 ...
2
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1answer
30 views

Port only in trunk mode vs encapsulating the frame

A network with 2 switches, each switch has 2 vlan, one called vlan 10 and another vlan 20. A port-channel with 2 uplinks (trunk). Why in a layer 2 scenario I don't need to configure the trunks with ...
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2answers
70 views

How to Change the Date on Cisco Catalyst 3750x Switch

We are using cisco catalyst 3750x 24 port switch series How to Change the Exact Date(Singapore) on a Switch ASW-G-L09-001#show running-config Building configuration... Current configuration : 11883 ...
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2answers
1k views

Whats the difference between VOICE VLAN and ACCESS VLAN

Can someone please tell me the difference in Layman's termsfor these 2 configurations? interface FastEthernet0/1 description PHONES switchport mode access **switchport voice vlan 51** spanning-...
2
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2answers
148 views

Fiber link loss on Cisco Catalyst 3750x series switch

I have cisco catalyst 3750x 24 port switch series switch, and the switch has C3KX-NM-10G module. Problem : I have connected fibre optic in SFP+ transceiver on G2/TE1 (Uplink).  After 7 to 8 hours, the ...
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2answers
92 views

Network ( routing and switching) , security

In my company network i am installing new cisco2811 router but i have problem, my LAN network can not ping and access network. i get point to point internet from ISP. PTP IP is 192.186.86.200/24 and ...
3
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1answer
108 views

Why can't get host's mac address on l2 switch through snmp? But can get it on l3 router

I am trying to get computer's mac address through snmp. I have an envirmont in GNS3: l3 R1's image is vios-adventerprisek9-m.SPA.157-3.M3 l2 SW1's image is viosl2-adventerprisek9-m.SSA....
4
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1answer
128 views

GNS3 switches vs Real switches performance

I want to emulate the performance of switches in GNS3, and the focus is not the configuration of switches. My questions are: Do emulated switches perform worst than actual switches? Are emulated ...
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1answer
55 views

Is it possible to assign an IP to a tagged dual-mode port (Brocade)

I have a router (ubiquity USG) and a Brocade FCX648 Layer 3 switch. (I have a second one in a stack, but that's unrelated). The end goal is to be able to connect the switch to my router, provide IPs ...
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3answers
218 views

What are the Major Differences between Juniper EX4200 vs Juniper EX4300?

Can someone please explain that what are the major differences between Juniper EX4200 and Juniper EX4300 switches? Both are standard Juniper Ethernet switches but is there any situation where EX4300 ...
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2answers
45 views

Need explanation on vlan tag/ip mismatch

What happens if I have a switch configured with an accessport on vlan 20 and someone uses a static ip in a different subnet. vlan 20 has the subnet 192.168.20.0/24 in the router. Suppose the ip used ...
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1answer
52 views

Virtual Chassis Setup in Juniper EX4200 Using Mixed Interface Types

We want to setup Virtual Chassis using 2 x Juniper EX4200 switches. In case of Virtual Chassis for EX4200 , we have to use 2 x VC cables (connected back to back) between 2 x Ex4200 switches along with ...
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2answers
856 views

Endpoint MAC address change detection [closed]

A question regarding a host behavior when gateway mac address has changed (although it deals with Windows, I think it's the best forum). Assuming a windows host sending trafic to a destination IP, ...
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3answers
82 views

What kinds of organizations use routing protocols (aside from ISPs)?

I don't understand why would an organization aside from an ISP even use routing protocols. Let's say there is a big company with 5000 employees, and they want to have a network throughout their ...
1
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1answer
73 views

Fastest way to switch between redundant wireless links

I have a system using 2 redundant point-to-point wireless links to access the internet, and I'm trying to find the fastest way to switch between them if one goes down. We need to switch within 1 ...
0
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1answer
29 views

Is SONET a physical layer or a data link layer?

According to some sources, SONET is physical layer. But some sources say that SONET can carry IP directly. Also, SONET defines its own frame -- it has a header and a payload. That must make SONET a ...
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2answers
46 views

Query regarding LACP System Priority

This is regarding LACP System Priority. From my research I could find the following info pertaining to system priority. LACP combines the System Priority value with the MAC address of the switch to ...
1
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2answers
92 views

Do X.25/Frame Relay/ATM/MPLS have their own switches?

In the context of networking when we say "switch" we always think of Ethernet switch. But do we have X.25 switch, Frame Relay switch, ATM switch, and MPLS switch? If yes, how are they ...
0
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1answer
51 views

Query regarding LACP timeout flag

Say we have two swicthes. Switch A and Switch B. Switch A sends LACPDU's with timeput flag set to 1 (fast). Switch B sends LACPDU's with timeout flag set to 0 (slow). By researching came to know that ...

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