Troubleshooting ACLs and Prefix Lists

6 important questions on Troubleshooting ACLs and Prefix Lists

What are 3 important rules for the processing of an IPv4 ACL

  1. Top-down processing
  2. Immediate execution upon a match
  3. Implicit deny any

What is the big difference between a Standard IPv4 ACL and an Extended IPv4 ACL?

  • Standard ACL uses the format
    sequence Deny | Permit ip-address wildcard bits wildcard-bits
  • Extended ACL can use various other filters like:
    Protocol, src subnet, dst subnet, host, port

IPv6 ACL processing is different from IPv4. What are the 4 steps in IPv6 ACL processing?

  1. Top-down processing
  2. immediate execution upon a match
  3. implicit permit icmp nd (NA or NS messages are permitted)
  4. implicit deny any
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What types of ACLs can be created for IPv6?

There is only one type of IPv6 ACL which is similar to the Extended IPv4 ACL. In that you can provide source, destination, protocol, ports, etc.

What are the 3 steps of Prefix List processing?

  1. Top-down processing
  2. Immediate execution upon a match
  3. implicit deny any

What is the difference between prefix list entries with GE or LE and without them?

  • Without the Ge or Le option the entry is treated as an address and subnet mask. Only exact matches will be matched.
  • With the Ge or Le option the entry is treated as an address and wildcard mask. The Ge or Le option indicate the subnet masks that match the entry.

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