Feature
SNAP 1 HDLC 2 Protocol Type
Destination Multicast MAC
PAgP 3
0x0104
01-00-0c-cc-cc-cc
PVST+, RPVST+ 4
0x010b
01-00-0c-cc-cc-cd
VLAN bridge
0x010c
01-00-0c-cd-cd-ce
UDLD 5
0x0111
01-00-0c-cc-cc-cc
CDP
0x2000
01-00-0c-cc-cc-cc
DTP 6
0x2004
01-00-0c-cc-cc-cc
STP UplinkFast
0x200a
01-00-0c-cd-cd-cd
IEEE spanning tree 802.1D
N/A—DSAP 7 42 SSAP 8 42
01-80-c2-00-00-00
ISL 9
N/A
01-00-0c-00-00-00
VTP 10
0x2003
01-00-0c-cc-cc-cc
IEEE Pause 802.3x
N/A—DSAP 81 SSAP 80
01-80-C2-00-00-00>0F
1 SNAP = Subnetwork Access Protocol.
2 HDLC = High-Level Data Link Control.
3 PAgP = Port Aggregation Protocol.
4 PVST+ = Per VLAN Spanning Tree+ and RPVST+ = Rapid PVST+.
5 UDLD = UniDirectional Link Detection.
6 DTP = Dynamic Trunking Protocol.
7 DSAP = destination service access point.
8 SSAP = source service access point.
9 ISL = Inter-Switch Link.
10 VTP = VLAN Trunk Protocol.
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unicast mac
HSRP   00-00-0c-07-ac-xx  virtual gateway mac 注：xx表示组id
VRRP   00-00-5e-00-01-xx  virtual gateway mac 注：xx表示组id