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2A. Layer 2 Switch Operation (Shared Media Network (Collision Domain (1…
2A. Layer 2 Switch Operation
Shared Media Network
Ethernet Hubs (CSMA/CD)
Collision Domain
1 host talk at one time
force every host operate 1/2 duplex
1 host send, all hear it
1 host generate frame w/ errors, all hear it as well
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Ethernet Switch
fwd frames based on dest. MAC. Ethernet Media is not shared on all connected hosts
The collision domain’s scope is severely limited.
■ full-duplex mode because there is no contention on the media. Hosts can talk and listen at the same time.
■ Bandwidth is no longer shared.(These frame forwarding paths change dynamically.)
■ Errors in frames are not propagated. (stored and fwd) Packets are received, stored for inspection, and then forwarded.
■ You can limit broadcast traffic to a volume threshold.
■ Other types of intelligent filtering or forwarding become possible.
Multiport Transparent Bridge
Forwarding Table
Record Source, and look up destination. otherwise "unknown unicast flooding"
STP algorithm must port is good for normal use
Broadcast or Multicast Destination
IPv4 brdcst > ffff.ffff.ffff multicast > 01xx.xxxx.xxxx
IPv6 multicast 3333.xxxx.xxxx
