3Com 8807 Command Reference Manual page 229

Table 31 Relationship of type and code
ICMP packet type (TYPE)
information-request
net-redirect
net-tos-redirect
net-unreachable
parameter-problem
port-unreachable
protocol-unreachable
reassembly-timeout
source-quench
source-route-failed
timestamp-reply
timestamp-request
ttl-exceeded
established: (Optional) It is effective only to the first SYN packet established by
TCP and active when protocol is set as tcp.
precedence precedence: (Optional) IP priority level, in a number (ranging from 0
to 7) or a name.
tos tos: (Optional) Indicating packets are classified by TOS value, in a number
(ranging 0 to 15) or a name.
dscp dscp: (Optional) Indicating packets are classified by DSCP value, in a number
(ranging from 0 to 63) or a name.
fragment: It is only effective to fragmented messages and is ignored by
non-fragmented messages.
bt-flag: It indicates that the rule is effective to BT data messages only. If you use
this key word, the protocol in the rule must be tcp. The parameter is applicable to
defining the advanced ACLs.
vpn-instance instance-name: VPN instance name. The specified MPLS VPN
packets will be identified if this parameter is selected.
Parameters specific to Layer 2 ACLs:
■
cos: Specifies 802.1p priority in the most external 802.1QTag carried by the
packet.
cos-value: In number format (ranging 0 to 7) or just entering the priority name.
See Table 1-5 for their correspondence.
Table 32 COS priority definition
Number
0
1
ICMP packet type (TYPE)
15
5
5
3
12
3
3
11
4
3
14
13
11
Priority name
best-effort
background
ACL Commands 227
ICMP code (CODE)
0
0
2
0
0
3
2
1
0
5
0
0
0