Configuring an IP prefix list

Configuring an IPv4 prefix list

If all the items are set to deny mode, no routes can pass the IPv4 prefix list. To allow unmatched IPv4 routes to pass, you must configure the permit 0.0.0.0 0 less-equal 32 item following multiple deny items.

To configure an IPv4 prefix list:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Configure an IPv4 prefix list.	ip prefix-list prefix-list-name [ index index-number ] { deny \| permit } ip-address mask-length [ greater-equal min-mask-length ] [ less-equal max-mask-length ]	By default, no IPv4 prefix list is configured.

Configuring an IPv6 prefix list

If all items are set to deny mode, no routes can pass the IPv6 prefix list. To allow unmatched IPv6 routes to pass, you must configure the permit :: 0 less-equal 128 item following multiple deny items.

To configure an IPv6 prefix list:

Step

Command

Remarks

1. Enter system view.

system-view

N/A

2. Configure an IPv6 prefix list.

Method 1:ipv6 prefix-list prefix-list-name [ index index-number ] { deny | permit } ipv6-address prefix-length [ greater-equal min-prefix-length ] [ less-equal max-prefix-length ]
Method 2:ipv6 prefix-list prefix-list-name [ index index-number ] { deny | permit } ipv6-address inverse prefix-length

By default, no IPv6 prefix list is configured.

When the inverse keyword is specified, an IPv6 prefix is matched from the least significant bit to the most significant bit.

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