Questions tagged [switching]
For questions related to traffic switching and troubleshooting the traffic switching process.
0
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0answers
15 views
Spanning tree priority values on port-channel
Group Port-channel Protocol Ports
-------------------------------------------------------------------------
1 Po1(U) LACP Gi0/3(P),Gi0/9(P)
4 Po4(U) LACP ...
2
votes
2answers
163 views
Spanning tree Priority values
show spanning-tree interface gigabitethernet 0/2
Switch default
Instance Role State Cost Prio type
-------- ---- ----- ---- ---- ----
MST00 ...
0
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1answer
15 views
Ethernet Protocols (Modbus TCP/IP & Ethernet/IP) can be in the same network and in a ring topology without problems?
Ethernet Protocols (Modbus TCP/IP & Ethernet/IP) can be in the same network and in a ring topology without problems?
Please, refer to the attached drawing.
What are the equivalent Cisco Switches ...
0
votes
2answers
29 views
Confused between packet switching and circuit switching
I am a bit confused between packet switching and circuit switching usage in telephones. If there is a loss of packet in packet switching or the packets may arrive in different order why is it still ...
0
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1answer
16 views
Is FDM and TDM only used in circuit switched networks?
I get the idea that TDM and FDM can be used in circuit switched networks, but what about packet switch ones? Can FDM be used?
0
votes
1answer
34 views
Tracking the packet flow thru a LAN
We are using a private 10.0.0.0/8 network for the management and other local traffic (storage) in our LAN as shown in the symbolic layout here:
10.0.0.1 10.0.0.2
Gateway ...
4
votes
1answer
112 views
What are reasons to configure a Voice VLAN using the Auxillary VLAN feature instead of a Trunk + Native vLAN
Imagine this topology:
[PC] ------- [VOIP Phone] ------- [eth0/0 on a Switch]
And this configuration on the switch:
vlan 22
name DATA
vlan 33
name VOICE
There are two ways to have both the PC'...
4
votes
2answers
237 views
Network Redundancy with LACP Trunking
I would like to set up a redundant link between two switches. I have four ports available to accomplish this.
Scenario A: Switch 1 has ports 1+2 trunked together via LACP. They are plugged into ...
1
vote
1answer
61 views
Networking Questions (Routing and Switching)
I inherited a haphazard network that I'm in the process of cleaning up and modernizing.
Here is a synopsis of the current issue:
We have a MySQL DB hosted on a Windows 7 PC (solely used to host the ...
2
votes
1answer
50 views
Routing and Switching & network monitoring
hi i am facing problem in juniper switch Model: ex4200-48t ,Junos: 15.1R6.7 . i deploy network monitoring check-MK software. there is showing errors of juniper switch ports and also show in logs file ...
2
votes
1answer
38 views
Two channels between two switches
Is there a way to provide two physically diverse channels between two switches? I'm using two Cisco Catalysis 3560s, and I want to have two separate channels between them, with different access ...
3
votes
1answer
44 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
86 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 (...
6
votes
2answers
575 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 ...
5
votes
1answer
120 views
Cross datacenter IP failover/migration
I am trying to wrap my head around this (very) simple issue of IP failover from one physical location to another. I have a few Virtual machines running at Site A where I need to rebuild the NAS. In ...
8
votes
3answers
1k 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?
2
votes
2answers
41 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 ...
1
vote
1answer
48 views
from where/how is the figure of 50 m sec protection switching time calculated in case of ERP/ MPLS?
From where or how does the figure of 50 m sec protection switching calculated for MPLS/ ERPS?
2
votes
1answer
49 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 ...
1
vote
1answer
74 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:
| ...
2
votes
2answers
46 views
Cisco router with switch interfaces help
I was wondering if a connection comes in on a Cisco router interface. Can that connection be pointed towards a switch interface if said router has a switching module?
I haven't tried it, but I'm ...
0
votes
2answers
51 views
Layer 2 Routing between subnets and VLANS [closed]
I am studying for my Networking exam and from what I have pieced together from other posts on here is this. Please correct me if I'm wrong:
Layer 2 switches can only route packets between different ...
3
votes
1answer
358 views
Using IGMP but Multicast still Flooding
Im new here.
I want to ask about the multicast,
The first case is, I have switch HP 2530 24 port with 24 10/100 and 2 100/1000 NIC, And i have servers with bandwidth video multicast around 120-...
1
vote
1answer
115 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 ...
1
vote
2answers
44 views
Advice on potentially needed subnet expansions
I work for a non-profit with some slightly more antiquated hardware. We have 3 locations, about 700 devices across them. Right now our locations are set up as:
Location 1 (Main) - /23 with a DHCP ...
0
votes
1answer
168 views
Is forwarding rate important for selecting a collapse core switch in IP camera implementation?
I need to select a core switch that will connect my access switch to an IP surveillance's server. The point is that in my network I'll have 109 IP camera sending real time traffic to the server and I'...
5
votes
2answers
73 views
Network Ten LTE Hubs Into One Network
I'm working through a tricky situation getting a field office set up out in a very rural area. There are ten 12' x 60' trailers being set up (2-3 metres apart from one another), each with varying ...
3
votes
2answers
43 views
Cisco Router 1800 series doesn't route internet
Working on an issue with a 1800 series Cisco Router. Router get's Internet just fine, can ping Google, Microsoft, etc.. Router is connected to a switch, switch connects 2 workstations running Windows ...
1
vote
2answers
59 views
Cellular signal handoff
In a cellular network like T-Mobile, Sprint, etc. if one sector of a tri-sector tower is maxed out and can't accept new calls, will a new call request normally served in that sector be handed off to ...
2
votes
1answer
115 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
1answer
52 views
Circuit switching. How is the data rate divided for each circuit in a link for FDM and TDM?
FDM allocates portions of bandwidth to each circuit in the link. According to the Nquist equation, this would propotionally divide the data rate among the circuits.
Now with TDM time slots are ...
2
votes
1answer
485 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, ...
1
vote
1answer
87 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
2answers
131 views
Multi Chassis Ether Channel Best Practice
in our topology we have our Data Server(Multi Virtual Servers) and Backup Server exist in two different buildings and the current connection between them as below:
Connection explanation:
*1st ...
3
votes
1answer
76 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
1answer
39 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
4answers
566 views
Can we run the Internet on circuit switching?
Generally we use IP and ATM for data communication and can we use circuit switching for data communication ?
Can we use circuit switching for Internet ?
4
votes
1answer
275 views
QoS Policing vs Shaping, why policing
Regarding QoS, we have two modes: shaping or policing.
The policing drops packets while shaping put the packets in buffer.
Shaping seems to be the better solution in a general ways, so, why use ...
1
vote
1answer
211 views
Cannot ping or SSH into new Catalyst 2960-CX switch from the server VLAN (1)
I recently setup a Cisco Catalyst 2960-CX switch at work (I'm a SysAdmin at a SMB). Our workstations use VLAN 3, but our servers use VLAN 1. The management IP of the new switch (in VLAN 3) is 192.168....
1
vote
0answers
59 views
Cisco stacking - priority and number information
In case of switches stacking, where are stored the information about the switch number and the switch priority ?
After a reset, these information were conserved.
1
vote
1answer
75 views
Calculating buffer capacity
The serialization delay is the amount of time it takes to forward bits out of an interface. A 1 gigabit per second interface can send 1 billion bits per second. One billion bits per second equates to ...
3
votes
2answers
845 views
Does it make sense to map a VLAN to each LAN?
I saw a picture of a network-structure with VLANs in it:
Why would somebody structure their network like this? Does this even make sense? I mean, they are in a different LAN, why then mapping a VLAN ...
2
votes
1answer
453 views
Really basic SG300 VLAN setup not working
My understanding of VLANs may need improved, but isn't the idea that you can run multiple LANs at layer 2 level over the same router if VLANs are setup correctly on the SG300? If so, I fail to see how ...
2
votes
1answer
61 views
Spanning tree behaviour - topology change
Regarding a next change we have to do, we are studying spanning tree behaviour.
Does the following statement is true ?
In the case of topology change, if a new BPDU is received:
Currently: Root ...
0
votes
1answer
36 views
What switching methods do SOHO switches use, like in cisco switches used?
Switching methods like,
Store and Forward
Cut-Through
Fragment-free
2
votes
0answers
102 views
Cisco: Routing issue between LANs [closed]
We have a project to create 3 offices, which are 3 different LANs where the configuration should be as follows:
Each Office should have 1 printer, where the office is able to print
They should be ...
1
vote
1answer
77 views
How to create vlan for admin?
I wanted create a separate vlan for admin and give access to other vlan , so what is the procedure or method to do it?
1
vote
2answers
497 views
Gratuitous arp and unicast flooding
we have few 100s of access switches connecting to a core 10k in IRF. Here all our access is pretty much dumb does only L2 job. So what happens now is unicast flooding, technically MAC ages out, ...
2
votes
1answer
116 views
Frame relay, PVC and DLCI
Regarding the frame relay technology, could you confirm to me that traffic using permanent virtual circuit use the same ISP routers in the path for all packets sent ?
I'm a little bit confused.
Frame ...
5
votes
1answer
191 views
Cisco Catalyst Line Cards - memory considerations
Do the Catalyst Line Cards (4500 and 6500 series) hold memory (kept after reload), or some other information independently of the Supervisor Card?
I ask regarding a chassis reset process, in order to ...
