How much VLAN traffic on .1Q trunk
Hi guys, we have two 6509 connecting to each other with eight L2 links which are .1q trunks. There are VLAN interfaces on both 6509 for vlan10 and vlan20. My question is how to find out how much vlan10 and vlan20 traffic going through on link1? I know we can get the stat on vlan interface, but are there any other ways to check it out on trunk interface?
6509 - eight .1Q trunks - 6509
Thanks. Leo
Hi rapper36,
From:
http://blogs.catapultsystems.com/cfuller/archive/2012/06/22/opsmgr-2012-resource-requirements-and-usage-recommendations-for-agent-and-agentless-monitoring-scom.aspx
OpsMgr 2012 Agentless Monitoring resource requirements:
Processor: < 1% average increase in processor utilization
Disk: < 1 average increase in pages per second
Disk: < 1 MB data (as there is no %programfiles%\System Center Operations Manager folder created)
Network: < 1 MB data sent and received to the system during installation
Memory: 14 MB less available memory
Time to Deploy to Monitored state: 2.5 minutes
After the agent was appearing as monitored the performance counters gathered prior to the installation were compared to those gathered after installation. The results indicate additional overhead associated with the Operations Manager 2012 agentless monitoring
after the agent was appearing as monitored.
Processor: < 1% average increase in processor utilization
Disk: < 1 average increase in pages per second
Disk: < 10 MB
Network: < 1 MB/min additional traffic
Memory: < 1 MB less available memory
Natalya
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From:
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Hi ,
Can someone please explain me why a trunk link, between two cisco switch, not allow a vlan x traffic if vlan x is not locally configured ?
In my lab I have three switch (2950 but it is the same with 2960 3750 etc).
Switch 1 is connected by trunk to switch 2 and switch 2 is connected by trunk to switch 3.
Switch 1 and switch 3 has configured vlan 10 and interfaces vlan 10 instead Switch 2 has not configured vlan 10
Vtp is disabled (transparent mode) in all switch
Switch 2 not permit switch1 to ping switch3 until I not configure vlan 10.
2950#sh int fa 0/9 status
Port Name Status Vlan Duplex Speed Type
Fa0/9 connected trunk a-full a-100 10/100BaseTX
2950#sh int fa 0/9 trun
Port Mode Encapsulation Status Native vlan
Fa0/9 on 802.1q trunking 1
Port Vlans allowed on trunk
Fa0/9 1-4094
Port Vlans allowed and active in management domain
Fa0/9 1-2,11,101
Port Vlans in spanning tree forwarding state and not pruned
Fa0/9 1-2,11,101
2950#sh vtp status
VTP Version : 2
Configuration Revision : 0
Maximum VLANs supported locally : 128
Number of existing VLANs : 8
VTP Operating Mode : Transparent
VTP Domain Name : daniele
VTP Pruning Mode : Disabled
VTP V2 Mode : Disabled
VTP Traps Generation : Disabled
MD5 digest : 0x63 0x6C 0xF9 0xF6 0xB9 0xDC 0xBE 0xF3
Configuration last modified by 192.168.0.103 at 0-0-00 00:00:00
2950#
It seem that vlan 10 is pruned but I don't understand why (vtp is disabled)
Thanks a lot for you help
DanieleHi lnrdnl78d,
so will give this ago not quite sure how a uploaded images looks,
i have mocked up what i have understood from your explanation so feel free to correct me if i have got this wrong :)
however assuming in this situation that VTP is enabled (which i know you have disabled in yours, but hoping this helps)
in this situation client 1 sends a broadcast to client two.
with VTP pruning enable switch 2 will learn that switch 4 has no ports connected to VLAN 2
so the trunk link to Switch 4 will have VLAN 2 pruned from the trunk link
but 2 and 3 will receive the broadcast and switch 3 will be the only one to forward it out the connected port
from my understanding this is what you have configured in your lab apart from switch 4 but added it to fit the example
does this help demonstrate it at all or am i way off ? -
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How many VLANs supported via MACsec VLAN-trunk link?
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http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/15-0_2_se/configuration/guide/3750x_cg/trustsec.html
Thanks,
CedarHi,
Any one know how many VLANs maximum allowed across a MACsec link between two C6500 with Sup2Ts or between two N7K respectively?
As far as I know, C3750X has limitation of 8 VLANs, according to
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http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/15-0_2_se/configuration/guide/3750x_cg/trustsec.html
Thanks,
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PieroUse the client reports from WCS reporting:
http://www.cisco.com/en/US/docs/wireless/wcs/6.0/configuration/guide/6_0reps.html#wp1134645
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•Session Count
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•% of Time
•% of Traffic
•% of Session
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SalvoI'm not sure what you are referring to. How many VLANs can be untagged while the port is in access? Or how many VLANs can you pass on a trunk?
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Wireshark capture on access port displays different vlan traffic
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i have a nexus 4001i Blade Center Switch where i have a server connected in mode access to a particular vlan.
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anybody have an idea why a server in mode access with wireshark is able to view different vlan traffic? I also see non multicast and non broadcast converations.
the port the server is connected to is not a monitor port but only in switch port mode access.
thanks in advance for you feedbackHi,
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Microsoft Network Load Balancing. As per the Microsoft Troubleshooting NLB:
In unicast mode (the default Forefront TMG cluster operation mode) NLB induces switch flooding, by design, relaying packets sent to the VIP addresses to all cluster hosts. Switch flooding is part of the NLB strategy for obtaining the best throughput for any specific load of client requests. However, if the NLB interfaces share the switch with other (non-cluster) computers, switch flooding can add to the other computers' network overhead by including them in the flooding and consequently have a detrimental effect on network and/or server performance.
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How much bandwidth netflow export uses
Experts,
I tried searching doc on cisco and even googled for information on how much bandwidth netflow export uses; however I didn't find any convincing article. I also found lancope.com where they estimate the BW required, but still I was not satisfied.
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xander thuijs CCIE#6775
Principal Engineer ASR9000/XR SW group -
Hi all
I have a 2900XL core switches which in turn connected to several 2950 switches. All are connected to VLAN 1.
I have a few questions:
When people say broadcast traffic should not be more than 20% of the VLAN traffic.
1. Does it mean the broadcast of a single port in the 2950 switch or the core switch ?
2. How do i know the VLAN traffic ?
Any tools etc and how is the setup?
Hope comeone can help. :)
Thanks in Advance.
AlanHi Narayanan,
This is Guru Prasad.R from Saksoft Ltd. I am working as Network Engineer for past 1 year here. Also i had worked as part-time technical assistace in Networking Environment for 3 years too.
Since, i am new guy to this networking world i may require your guidance, support for making my career the best one.
I had finished my CCNA & 2-MCP exams one for Server 03 & another for Exchange Server 03. Also currently i doing with CCNP-Switching[BCMSN] exam.
Kindly help me to make my career the best one. Expeting your kindness on the same.
I had noted down ur contact number in Cisco profile. Below given my contact details:
Guru Prasad.R
Mobile: +91-9840822258
Mail id: [email protected]
Expecting your reply mail for the same.
Thanks & Regards,
Guru Prasad .R -
Traffic on interfaces trunk - Network Ingraestructure
I wanted to know if it is normal that all traffic on my network this through all trunk ports of switches
I set a sniffer and a switch connected without any connection trunk only to validate, the sniffer see that you are getting all network traffic through the trunk.
What can be causing this behavior and what considerations should be taken apart filtering vlans?
Regards.Now I might have misunderstood your concern but I'll give it a shot:
Trunks carry traffic for multiple vlans and with no filtering in place they carry traffic for all vlans configured, normally you will see broadcasts e.g. DHCP or ARP requests going through all the trunk ports on a switch (that are not STP Blocking). This is normal behaviour.
However if your sniffer is picking up a lot of packets that are meant for unicast destinations going out all trunk ports and also being captured by your sniffer over some time, then could be something else. CAM Overflows result in the switch flooding packets out all ports that are in the same vlan and out all trunk ports on which the vlan is allowed. This would result in the behaviour you observed. you can use the show mac address-table count to verify mac address space.
Hope this helps
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