3com S7906E Guide De Référence

 

1-26 

undo ip ip-prefix ip-prefix-name [ index index-number ] 

System view 

2: System level 

ip-prefix-name: IPv4 prefix list name, a string of 1 to 19 characters. 

index-number: Index number, in the range 1 to 65535, for uniquely specifying an item of the IPv4 prefix 

list. An index with a smaller number is matched first. 

permit: Specifies the matching mode for the IPv4 prefix list item as permit, that is, if a route matches the 

item, the route passes the IPv4 prefix list without needing to match against the next item; if not, it will 

match against the next item (supporse the IPv4 prefix list has multiple items configured ).  

deny: Specifies the matching mode for the IPv4 prefix list item as deny, that is, if a route matches the 

item, the route neither passes the filter nor matches against the next item; if not, the route will match 

against the next item (supporse the IPv4 prefix list has multiple items configured ).  

ip-address mask-length: Specifies an IPv4 prefix and mask length. The mask-length is in the range 0 to 

32. 

min-mask-length, max-mask-length: Specifies the prefix range. greater-equal means “greater than or 

equal to” and less-equal means “less than or equal to”. The range relation is mask-length <= 

min-mask-length <= max-mask-length <= 32. If only the min-mask-length is specified, the prefix length 

range is [ min-mask-length, 32 ]. If only the max-mask-length is specified, the prefix length range is 

[mask-length, max-mask-length ]. If both min-mask-length and max-mask-length are specified, the 

prefix length range is [ min-mask-length, max-mask-length ]. 

Use the ip ip-prefix command to configure an IPv4 prefix list or an item of it. 

Use the undo ip ip-prefix command to remove an IPv4 prefix list or an item of it.  

No IPv4 prefix list is configured by default.  

An IPv4 prefix list is used to filter IPv4 addresses. It may have multiple items, each of which specifies a 

range of IPv4 prefixes. The relation between the items is logic OR, namely, if an item is passed, the IPv4 

prefix list is passed. If no item is passed, the IP prefix list cannot be passed. 

The IP prefix range is determined by mask-length and [ min-mask-length, max-mask-length ]. If both 

mask-length and [ min-mask-length, max-mask-length ] are specified, the IP address must satisfy both 

of them.  

If both ip-address and mask-length are specified as 0.0.0.0 0, only the default route will be matched.  

To match all routes, use 0.0.0.0 0 less-equal 32. 

# Define IP prefix list p1 to permit routes matching network 10.0.192.0/8 and with mask length 17 or 18. 

<Sysname> system-view 

[Sysname] ip ip-prefix p1 permit 10.0.192.0 8 greater-equal 17 less-equal 18