Latest threads in Ethernet LANshow only best voted threads
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MPLS
Hello studying new for me material on MPLS, and have a few questions on it: With my current understanding, to have mpls correctly run on a router, one needs a routing protocol(s) on the same router,...
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12 years ago
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BPSK
(snip, I wrote) It seems that signal processing people disagree, though I am not sure why. Sorry for the slow reply. It seems that the server that I posted from doesn't get incoming posts. I switched...
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12 years ago
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Where is generated the preamble?
Hi Rich, Many thanks for your interresting reply. Thanks for this statement, written like this. I have to note that for my students. There is a slightly difference between 802.3-2005 (or before) and...
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12 years ago
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EFM frames on tagged port
Hello, Reading the specs I didn't completely understand if EFM, CFM or LLDP frames can be tagged or not. Specifically, what is the behavior of a L2 switch when sending out such frames out a trunk...
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12 years ago
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for LACP, what is management key ,operation key and admin key?
How do these keys generated? and what is purpose for these key? management key=admin key? what I think is that it is important when connect to difference vendor. anyone can expain it? TIA. st
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12 years ago
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Cisco Wireless -N Home Router WRT120N
Greetings, Out of the box, I set up the WRT120N router per instructions from the manual. Problems: 1. I need to power-cyle the router every 24 hours for the devices to identify the hotspot, if I...
20
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12 years ago
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MAC acl
Hello, some Cisco switches support MAC access lists on ingress traffic only. I'm trying to understand why it doesn't make sens (impossible?) to implement MAC ACLs on *egress* traffic. Is it because...
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12 years ago
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priority tagged frames
Hello I hear that priority-tagged frames, i.e. frames having 0x8100 ethertype AND valan id equal to 0, are considered untagged from the VLAN-aware bridge perspective. however I could find exact...
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12 years ago
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expected behavior of 802.1p mapping & schedulers
Hello, I'm trying to understand the expected behavior of a L2 switch with enabled QoS and 802.1p mapping, i.e. cos 0 is mapped to queue 0, cos 1 to queue 1 and so on. Consider example: 1G ports, pump...
2
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12 years ago
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why we need 'bridge'
Hi, many layer2 ethernet equipment vendor, Cisco as example, have a concept (I don't really know if it is correct to call it concept?) of a 'bridge', i.e. on cisco CLI one needs to explicitly create...
6
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12 years ago
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switch port types (access, trunk, hybrid ..)
Hello, usually ports on the L2 switches (I don't know agbout L3) can be configured in the following modes: access, hybrid or trunk (I think, terminology may vary among the different vendors). The IEEE...
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12 years ago
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MAC learning on switch
Hi All, I thought that MAC learning process is purely hardware, but wa recently told that in fact most decent hi-end L2 switches off-load part of this activity on the host CPU, specifically -- every...
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12 years ago
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Layer 3 Bit Error Tester
I need a testing device to bit error test optical ethernet ports on a router. Can someone suggest a device that can be purchased cheaply, preferably used? To my understanding, a layer 3 IP based bit...
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12 years ago
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testing QoS with conventional PCs
Hello, what are the methods to test QoS functions (specifcally I'm interested in traffic shaping, scheduling) without packet generators Smartbits or Ixia, but having only a few PCs and a target board...
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12 years ago
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Wanted - 3Com 3C505 Technical Reference Manual
Hi, I'm looking for the technical reference manual for 3Com's 3C505 Ethernet controller. This manual is mentioned in several drivers for that card (Linux, DOS packet drivers, etc.) - however, I could...
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12 years ago
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