Cisco Ethernet switch Manuel d'utilisateur Page 23

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© 2002, Cisco Systems, Inc. All rights reserved.
l2-security-bh.ppt
Cisco Switching Control Protocols
¥ Used to negotiate trunk status, exchange VLAN information, etc.
¥ The majority use an IEEE 802.3 w/802.2 SNAP encapsulation
Includes LLC 0xAAAA03 (SNAP), and the Cisco OUI 0x00000C
Most use multicast destination addresses
Usually a variation on 0100.0ccc.cccc
Source address is derived from a bank of available addresses
included in an EPROM on the chassis
SNAP Protocol Type varies and will be included through the rest of
the talk.
¥ CDP and VTP (two common Cisco control protocols) are passed
over VLAN 1 only. If VLAN 1 is cleared from a trunk, although no
user data is transmitted or received, the switch continues to pass
some control protocols on VLAN 1.
For this reason (and the fact that VLAN 1 can not be deleted) donÕt
use it if you donÕt need to.
Lots of detail: http://www.cisco.com/warp/public/473/103.html
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