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请教VLAN

请教VLAN# EmergingNetworking - 热门网络技术

h*o2007-10-28 07:10

1 楼

Based on my understanding, VLAN is similar to multicast. But one happens at
L2, the other happens at L3: VLAN restricts Broadcast to a part of LAN,
multicast restricts Broadcast to a part of network. VLAN table is kept by
bridge; multicast is kept by multicast router.It is correct?
My question is how do I decide which VLAN should the packet be broadcast to?
It is said that there is an Ethernet frame tag header for VLAN ID. Does it
use
"Destination Address" of Ethernet frame?

b*e2007-10-28 07:10

2 楼

This is NOT a networking 101 board.

at
to?

【在 h**o 的大作中提到】

: Based on my understanding, VLAN is similar to multicast. But one happens at
: L2, the other happens at L3: VLAN restricts Broadcast to a part of LAN,
: multicast restricts Broadcast to a part of network. VLAN table is kept by
: bridge; multicast is kept by multicast router.It is correct?
: My question is how do I decide which VLAN should the packet be broadcast to?
: It is said that there is an Ethernet frame tag header for VLAN ID. Does it
: use
: "Destination Address" of Ethernet frame?

L*t2007-10-28 07:10

3 楼

A good place for networking intro:
http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/index.htm

at
to?

【在 h**o 的大作中提到】

w*x2007-10-28 07:10

4 楼

read 802.1Q first. should be very easy to understand.

w*s2007-10-28 07:10

5 楼

Not sure what you want to ask. VLAN, just like its name, Virtual LAN, has
the same feature as LAN. All broadcasts are limited in one subnet. So the
packet will be broadcast only among its own subnet(cuz the router did not
forward broadcast). The communication between two VLANs needs the support of
a router.