LINKING INNER AND OUTER MPLS LABELS
A method of linking inner and outer MPLS labels to provide enhanced security is disclosed. The method of linking inner and outer MPLS labels to provide enhanced security includes provisioning both an outer label database with reference keys. The outer label database entry provides a key that must be used in conjunction with the inner label database lookup to realize appropriate actions. As the provided key is not publically accessible an additional increment of security is provided. The method of linking inner and outer MPLS labels to provide enhance security is particularly useful blocking malicious packets from being sent into a remote VLAN or VFI.
1 . A method executed within a network equipment element to cause the network equipment element to process an MPLS packet having an outer label and an inner label, said method comprising the steps of:
establishing a first database containing entries corresponding to valid outer labels;
associating a key with each entry in said first database;
establishing a second database containing entries corresponding to a combination of said key with valid inner labels and the appropriate actions associated with said valid inner labels;
retrieving said associated key when said MPLS packet's outer label has a corresponding entry in said first database; and
combining said associated key with said MPLS packet's inner label to generate a lookup entry value for said second database.
2 . A method as claimed in claim 1 further comprising using said lookup entry value to check for a corresponding entry in said second database; and
if no match is found then to drop said MPLS packet.
3 . A method as claimed in claim 2 further comprising if no match is found then to flag a security alarm.
4 . A method as claimed in claim 1 further comprising using said lookup entry value to check for a corresponding entry in said second database; and
if a match is found then to retrieving and executing the associated action.
5 . A method as claimed in claim 1 wherein said combining step comprises appending said associated key to said MPLS packet's inner label.
6 . A method as claimed in claim 1 wherein said combining step comprises hashing said associated key to said MPLS packet's inner label.
7 . A method as claimed in claim 1 wherein said network equipment element comprises one of the set of a Label Switched Router and a Label Edge Router.
8 . An article of manufacture for use in programming a network equipment element to cause the network equipment element to process an MPLS packet having an outer label and an inner label, the article of manufacture comprising computer useable media accessible to the network equipment element, wherein the computer useable media includes at least one computer program that is capable of causing the network equipment element to perform the steps of:
establishing a first database containing entries corresponding to valid outer labels;
associating a key with each entry in said first database;
establishing a second database containing entries corresponding to a combination of said key with valid inner labels and the appropriate actions associated with said valid inner labels;
retrieving said associated key when said MPLS packet's outer label has a corresponding entry in said first database; and
combining said associated key with said MPLS packet's inner label to generate a lookup entry value for said second database.
9 . An article of manufacture as claimed in claim 8 further comprising
using said lookup entry value to check for a corresponding entry in said second database; and
if no match is found then to drop said MPLS packet.
10 . An article of manufacture as claimed in claim 9 further comprising
if no match is found then to flag a security alarm.
11 . An article of manufacture as claimed in claim 8 further comprising
using said lookup entry value to check for a corresponding entry in said second database; and
if a match is found then to retrieving and executing the associated action.
12 . An article of manufacture as claimed in claim 8 wherein
said combining step comprises appending said associated key to said MPLS packet's inner label.
13 . An article of manufacture as claimed in claim 8 wherein
said combining step comprises hashing said associated key to said MPLS packet's inner label.
14 . An article of manufacture as claimed in claim 8 wherein
said network equipment element comprises one of the set of a Label Switched Router and a Label Edge Router.