Questions tagged [switching]

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

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42 views

Creating a distributed ethernet using a single mode fiber ring

Can I create a distributed ethernet using just 1 x core of a single mode fiber ring ? This is an existing installation, I can't change the following constants: I have approx 100 locations (nodes) in ...
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0answers
15 views

Are internal routers even sold anymore? [closed]

CCNA emulators have routers in them, but in real life I only see L3 switches used to route between subnets. Are non-edge routers even sold by Cisco (or other vendors) anymore. Yes, I understand that ...
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2answers
35 views

Juniper EX Switch as router with transfer network for upstream network

So im new at juniper and networking. On my Juniper EX4550 switch i want to setup a transfer network to my upstream provider. So my upstream provider assigned a /30 subnet for the transfer network: ...
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1answer
74 views

IPv6 neighbour discovery blocked by MLD snooping switch

I recently noticed that my IPv6 multicast traffic was being broadcasted to all hosts connected to a switch, even those that had not subscribed to the traffic. To fix this, I enabled MLD snooping on ...
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1answer
1k views

Does an unmanaged switch deal with IP addresses at all

My belief is that an unmanaged plug-and-play layer 2 network switch only deals with MAC addresses. When computer A on a local network wants to communicate with computer B for example through the ...
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1answer
81 views

HSRP on multilayer switch not working

I have this network topology in Packet Tracer, and i wanted to implement HSRP on both of the multilayer switches. So what i made here is the switch on the left, both the laptop and the server are on ...
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0answers
49 views

Storm control problem with Juniper switch configuration (EX2300)

I am new with Juniper and generally new with switch configuration. Probably screwed up a lot but anyways, I will share my configuration right after I say what I want. I am getting Internet on ...
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2answers
45 views

Is this description of data transmission over L3 switch correct?

So I'm trying to describe how data is transmitted over a layer 3 switch (within same Vlan and between Vlan) but I'm not sure if I have understood it correctly. Can anybody verify if this description ...
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1answer
72 views

find out physically connected cisco switches

I am working with hardware guys and trying to monitor switches.Those guys deployed switches with some connectors,to implement such a logic in which whenever switch A goes down switch B goes down as ...
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2answers
115 views

Message switching vs packet switching with respect to congestion traffic

Packet switching uses store and forward technique to forward packet. And message switching is also uses store and forward technique to forward message. But in packet switching data transfer faces ...
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2answers
114 views

Routing between SVI and routed port on router

How can I achieve reachability from vlan terminated on the L3 switch to routed port on the router, FW? F.E int vlan 10,50 are the SVI's on L3 switch vlan 10 - 10.0.10.254 /24 vlan 50 - 10.0.50.254 /24 ...
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2answers
63 views

Can anyone please explain L3 SVI configuration ,What is SVI and Where do we use it?

I am learning about switching and came across SVI in vlans ,I Googled and watched couple videos and got really confusing Firsly where do we use Svi? and why do we use it,How to configure svi and what ...
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1answer
28 views

Avoiding FPCs rebooting during RE switchover on Juniper EX8200 Switche

We have Juniper EX8208 chassis based switch running in a production environment. The switch has 2 REs running in active and standby role with RE0 being the primary routing engine. The device is ...
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2answers
51 views

L3 switching and broadcast

I don’t know is this the right way to ask this question. But anyway my question is when we configure L3 switchport as a routed port and it’s connected to a another L3 switch. Does that routed port ...
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1answer
77 views

Need help with HPE tagging and hybrid-mode port

At my office I have two switches. SW-1 (HP-V1910-48G) is the switch my desktops are connected to, and SW-2 (HPE-1920 JG927A) is where my server rack with my dhcp and default gateway is connected. ...
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2answers
138 views

Can't ping the second network interface connected to a switch [closed]

I have the following topology: Default Gateway1 <--> SWITCH1 <--> [ NIC2 - (Windows 10 PC) - NIC1 ] <--> SWITCH2 <--> Default Gateway2 --> Internet NIC1 is DHCP configured, ...
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1answer
34 views

ARP isn't showing all the interfaces/MAC bindings

I'm playing with Dot1x port authentication, the interface G2/0/2 is connected to a PC and is authenticated/authorized successfully: SW1-2960#show authentication sessions int g2/0/2 det ...
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1answer
65 views

I cant ping across Lan?

Current configuration : 2695 bytes ! version 15.1 no service timestamps log datetime msec no service timestamps debug datetime msec service password-encryption ! hostname ...
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0answers
35 views

iBGP Question reagrding Distribute - List from EIGRP

So, I have the following topology. A-B | | C-D A-B-C-D are Routers. It doesn't matter what are the IP's of the interfaces. What matters is that I have 2 loopbacks for each router. 1.1.1.1 and 11.11....
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25 views

the performance improvement of Cisco's CEF, compared to the other (inferior) switching techniques

On the road of getting more insight on Cisco's CEF implementation .. can someone quantify, what is the raw performance improvement (gain) of CEF compared to process-switching, fast-switching? .. maybe ...
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1answer
27 views

Access layer switches uplink mode

We have core, distribution and access layer switches. the switches in access layer connect several workstations on VLAN 20 only. we have DHCP server on VLAN 1 but is on another switch with all servers....
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1answer
32 views

Unable to ping switch

Why can't i ping S1 from PC-B, but it's possible to ping PC-A? S1#show running-config Building configuration... Current configuration : 1638 bytes ! version 16.3.2 no service timestamps log datetime ...
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1answer
85 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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19 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
131 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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2answers
24 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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15 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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1answer
63 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 ...
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2answers
228 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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1answer
94 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
467 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
292 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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1answer
139 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
97 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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1answer
132 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
68 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
111 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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3answers
504 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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1answer
72 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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3answers
238 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 ...
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1answer
42 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
84 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 ...
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2answers
131 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 ...
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1answer
76 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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2answers
216 views

Criteria to match for lacp status to come up

I did research and found that below are the minimum requirements for LACP to be Up. One of the side should be active. All the port speed should be same. Duplex settings need to be same. Also I have ...
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1answer
26 views

Wants to understand traffic flow of Catalyst layer3 Switch 3850 . what are sequence this switch will check to delivery packet to destination

i wants to know clear understanding about how Cisco layer3 switch checks in sequence order when traffic arrive to its L3 Interface . i want to know traffic flow in Cisco layer 3 switch ,because switch ...
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0answers
40 views

Issue with PIM-SSM Multicast Configuration ISR4431s

I have an issue with my PIM-SSM multicast configuration using ISR4431s.    I am wanting to forward broadcast data from an application from one VLAN in on the multicast source to another VLAN on a ...
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1answer
316 views

Sending a gratuitous ARP on an interval - Cisco

In response to my question Propagating Static MAC Addresses , I realize I can not avoid the unknown unicast problem. Essentially I have hosts that forward their traffic via an L2 frame to a ...
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3answers
117 views

Propagating Static MAC Addresses

I have a situation where I need to place a static MAC on a switch as the server in question does not generate any outbound traffic. This static MAC seems as if it will work for hosts on the same ...
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1answer
108 views

Do switches allow parallel connections?

I am new to networking and not from Engineering domain. Sorry If I sound silly. I came across an article on Network Switches and How they work. Diving deep into it, I found some interesting topics ...

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