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3Com Switch 8800 Configuration Guide Chapter 32 ACL Configuration
32-6
Table 32-6 Length of template elements
Name Description Length in template
cos 802.1p priority 1 byte
dip Destination IP field in IP packet header 4 bytes
dmac
Destination MAC field in Ethernet packet
header
6 bytes
dport Destination port field 2 bytes
dscp DSCP field in IP packet header
ip-precedence IP precedence field in IP packet header
tos ToS field in IP packet header
exp EXP field in MPLS packet
1 byte
ethernet-protocol Protocol field in Ethernet packet header 4 bytes
fragment-flags
Flag field of fragment in IP packed
header
No bytes
icmp-code ICMP code field 1 byte
icmp-type ICMP type field 1 byte
ip-protocol Protocol field in IP packet header 1 byte
sip Source IP field in IP packet header 4 bytes
smac MAC field in Ethernet packet header 6 bytes
sport Source port field 2 bytes
tcp-flag Flag field in TCP packet header 1 byte
vlanid Vlan ID of the packet 2 bytes
c-tag-cos
802.1p priority in the Internal 802.1Q tag
(internal tag of QinQ tag-in-tag
application)
2 bytes
c-tag-vlanid
Vlan ID in the internal 802.1Q tag
(internal tag of QinQ tag-in-tag
application)
2 bytes
bt-flag Flag for Bit Torrent peer-to-peer service 2 bytes
Note:
The numbers listed in the table are not the actual length of these elements in IP packets,
but their length in flow template. DSCP field is one byte in flow template, but six bits in
IP packets. You can judge the total length of template elements using these numbers.
The dscp, exp, ip-precedence and tos fields jointly occupy one byte. One byte is
occupied no matter you define one, two or three of these fields.