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Advanced Configuration and Management Guide
The <as-regular-expression> parameter specifies the AS path information you want to permit or deny to routes
that match any of the match statements within the ACL. You can enter a specific AS number or use a regular
expression. For the regular expression syntax, see “Using Regular Expressions” on page 10-49.
The neighbor command uses the filter-list parameter to apply the AS-path ACL to the neighbor. See “Adding
BGP4 Neighbors” on page 10-14.
USING THE WEB MANAGEMENT INTERFACE
1. Log on to the device using a valid user name and password for read-write access. The System configuration
panel is displayed.
2. Click on the plus sign next to Configure in the tree view to display the list of configuration options.
3. Click on the plus sign next to IP to display the list of IP configuration options.
4. Select the AS Path Access List
link.
• If the device does not have any AS Path ACLs, the IP AS Path Access List panel is displayed, as shown
in the following example.
• If an AS Path ACL is already configured and you are adding a new one, click on the Add AS Path
Access List link to display the IP AS Path Access List panel, as shown in the following example.
NOTE: You cannot modify an AS Path ACL. Instead, you can delete and then re-add the ACL. To delete
an ACL, click on the Delete button to the right of the row describing the ACL, then click on the Add AS Path
Access List link.
5. Edit the ACL ID in the ID field, if needed. You can enter a number from 1 – 199.
6. Edit the number in the sequence number in the Sequence field, if you want to override the automatically
generated sequence number. You can configure up to 199 entries in an AS-path list. If you do not specify a
sequence number, the software numbers them in increments of 5, beginning with number 5. The software
interprets the entries in an AS-path list in numerical order, beginning with the lowest sequence number.
7. Select the action you want the software to perform if a route’s AS path list matches this ACL entry. You can
select Deny or Permit.
8. Enter a regular expression to specify the AS path information you want to permit or deny to routes that match
this ACL entry. You can enter a specific AS number or use a regular expression. For the regular expression
syntax, see “Using Regular Expressions” on page 10-49.
9. Click the Add button to save the change to the device’s running-config file.
10. Repeat steps 6 – 9 for each entry in the ACL. To create another AS Path ACL, go to step 5.
11. Select the Save
link at the bottom of the dialog. Select Yes when prompted to save the configuration change
to the startup-config file on the device’s flash memory.
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