Mobile IP mobility agent standby protocol
First Claim
1. A computer readable medium for performing a method of providing Mobile IP redundancy in a standby Mobility Agent, comprising the following instructions:
- instructions for determining that an active Mobility Agent, with which the standby Mobility Agent shares a virtual IP address known to a Mobile Node, is no longer acting as a Mobility Agent on a network segment for the Mobile Node;
instructions for assuming the role of active Mobility Agent for the shared virtual IP address on the network segment, thereby handling registrations from the Mobile Node; and
instructions for sending a list of registrations currently handled by the active Mobility Agent on the network segment to a new standby Mobility Agent on the network segment.
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Accused Products
Abstract
Disclosed is a method and apparatus for automatically backing up a Home Agent in Mobile IP. The method employs important components of the widely-used Hot Standby Router Protocol, but extends it to include synchronization of the mobility binding table between an active Home Agent and a standby Home Agent that backs it up. Also disclosed is a more general protocol for extending HSRP and related redundancy protocols to synchronize higher level functions other than mobility binding lists in Mobile IP (e.g., address translation tables in Network Address Translation (NAT), address bindings in Dynamic Host Configuration Protocol (DHCP) servers, dynamic ACL in Reflexive Access List, and TCP and GTP layer context in GPRS support nodes: SGSN & GGSN). Still other protocols that could benefit from HSRP include Lock and Key, Context-Based Access List, IP Security (IPSec), and H.323 gatekeeper.
281 Citations
50 Claims
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1. A computer readable medium for performing a method of providing Mobile IP redundancy in a standby Mobility Agent, comprising the following instructions:
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instructions for determining that an active Mobility Agent, with which the standby Mobility Agent shares a virtual IP address known to a Mobile Node, is no longer acting as a Mobility Agent on a network segment for the Mobile Node;
instructions for assuming the role of active Mobility Agent for the shared virtual IP address on the network segment, thereby handling registrations from the Mobile Node; and
instructions for sending a list of registrations currently handled by the active Mobility Agent on the network segment to a new standby Mobility Agent on the network segment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A standby Mobility Agent for providing Mobile IP redundancy, comprising:
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means for determining that an active Mobility Agent, with which the standby Mobility Agent shares a virtual IP address known to a Mobile Node, is no longer acting as a Mobility Agent on a network segment for the Mobile Node;
means for assuming the role of active Mobility Agent on the network segment for the shared virtual IP address, thereby handling registrations from the Mobile Node; and
means for sending a list of registrations currently handled by the active Mobility Agent on the network segment to a new standby Mobility Agent on the network segment.
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13. A standby Mobility Agent for providing Mobile IP redundancy, comprising:
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a processor; and
a memory, wherein at least one of the processor and the memory are adapted for;
determining that an active Mobility Agent, with which the standby Mobility Agent shares a virtual IP address known to a Mobile Node, is no longer acting as a Mobility Agent on a network segment for the Mobile Node;
assuming the role of active Mobility Agent on the network segment for the shared virtual IP address, thereby handling registrations from the Mobile Node; and
sending a list of registrations currently handled by the active Mobility Agent on the network segment to a new standby Mobility Agent on the network segment. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A computer readable medium for maintaining Mobile IP operation in an active Mobility Agent on a network segment, comprising:
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instructions for registering a Mobile Node;
instructions for creating a registration entry internally for the Mobile Node; and
instructions for sending a message notifying a standby Mobility Agent on the network segment of the registration, the active Mobility Agent and the standby Mobility Agent sharing a virtual IP address known to the Mobile Node. - View Dependent Claims (25, 26, 27, 28)
instructions for receiving a request from the standby Mobility Agent to dump registration entries for an entire mobility binding table, or a visitor table, containing multiple registration entries from the active Mobility Agent to the standby Mobility Agent; and
instructions for dumping the registration entries for the mobility binding table from the active Mobility Agent to the standby Mobility Agent.
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26. The computer readable medium of claim 24, further comprising:
instructions for periodically sending hello messages to the standby Mobility Agent, thereby notifying the standby Mobility Agent that the active Mobility Agent continues to function as the active Mobility Agent.
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27. The computer readable medium of claim 24, further comprising:
instructions for periodically sending hello messages to a standby group of routers, each configured to act as an active Mobility Agent, thereby notifying the standby group that the active Mobility Agent continues to function as the active Mobility Agent.
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28. The computer readable medium of claim 24, further comprising:
instructions for sending a resign message to the standby Mobility Agent before resigning the post of active Mobility Agent.
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29. An active Mobility Agent on a network segment, the active Mobility Agent being adapted for maintaining Mobile IP operation, comprising:
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a processor; and
a memory, at least one of the processor and the memory being adapted for;
registering a Mobile Node;
creating a registration entry internally for the Mobile Node; and
sending a message notifying a standby Mobility Agent on the network segment of the registration, the active Mobility Agent and the standby Mobility Agent sharing a virtual IP address known to the Mobile Node. - View Dependent Claims (30, 31, 32, 33)
receiving a request from the standby Mobility Agent to dump registration entries for an entire mobility binding table, or a visitor table, containing multiple registration entries from the active Mobility Agent to the standby Mobility Agent; and
dumping the registration entries for the mobility binding table from the active Mobility Agent to the standby Mobility Agent.
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31. The active Mobility Agent of claim 29, wherein at least one of the processor and the memory are further adapted for:
periodically sending hello messages to the standby Mobility Agent, thereby notifying the standby Mobility Agent that the active Mobility Agent continues to function as the active Mobility Agent.
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32. The active Mobility Agent of claim 29, wherein at least one of the processor and the memory are further adapted for:
periodically sending hello messages to a standby group of routers, each configured to act as an active Mobility Agent, thereby notifying the standby group that the active Mobility Agent continues to function as the active Mobility Agent.
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33. The active Mobility Agent of claim 29, wherein at least one of the processor and the memory are further adapted for:
sending a resign message to the standby Mobility Agent before resigning the post of active Mobility Agent.
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34. An active Mobility Agent adapted for maintaining Mobile IP operation, comprising:
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means for registering a Mobile Node;
means for creating a registration entry internally for the Mobile Node; and
means for sending a message notifying a standby Mobility Agent on the network segment of the registration, the active Mobility Agent and the standby Mobility Agent sharing a virtual IP address known to the Mobile Node.
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35. A router adapted for providing redundancy for a network segment, comprising:
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means for assuming the status of standby router on the network segment to backup an active router on the network segment, with which the standby router shares a virtual IP address known to a host based at the network segment;
means for determining that the active router is no longer acting as an active router for the host;
means for assuming the role of active router for the shared virtual IP address, thereby handling packet exchange tasks for the host; and
means for apprising a new standby router of an entry to a dynamic list specifying the status of one or more hosts based at the network segment.
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36. A router adapted for providing redundancy for a network segment, comprising:
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a processor; and
a memory, at least one of the processor and the memory being adapted for;
assuming the status of standby router on the network segment to backup an active router on the network segment, with which the standby router shares a virtual IP address known to a host based at the network segment;
determining that the active router is no longer acting as an active router for the host;
means for assuming the role of active router for the shared virtual IP address, thereby handling packet exchange tasks for the host; and
apprising a new standby router of an entry to a dynamic list specifying the status of one or more hosts based at the network segment.
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37. A computer readable medium for providing redundancy for a network segment, comprising:
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instructions for assuming the status of standby router on the network segment to backup an active router on the network segment, with which the standby router shares a virtual IP address known to a host based at the network segment;
instructions for determining that the active router is no longer acting as an active router for the host;
instructions for assuming the role of active router for the shared virtual IP address, thereby handling packet exchange tasks for the host; and
instructions for apprising a new standby router of an entry to a dynamic list specifying the status of one or more hosts based at the network segment.
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38. In a standby Mobility Agent, a method of providing Mobile IP redundancy, the method comprising:
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receiving a list of registrations for one or more Mobile Nodes from an active Mobility Agent on a network segment, the active Mobility Agent sharing a virtual IP address with the standby Mobility Agent;
determining that the active Mobility Agent is no longer acting as a Mobility Agent on the network segment; and
assuming the role of active Mobility Agent on the network segment for the shared virtual IP address, thereby handling the list of registrations for the one or more Mobile Nodes. - View Dependent Claims (39, 40, 41, 42, 43, 44, 45, 46, 47)
after assuming the role of active Mobility Agent on the network segment, sending a list of registrations currently handled by the active Mobility Agent on the network segment to a new standby Mobility Agent on the network segment.
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40. The method as recited in claim 39, wherein the list of registrations sent comprises one or more entries from a mobility binding table maintained by the active Mobility Agent.
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41. The method as recited in claim 39, wherein the list of registrations sent comprises one or more entries from a visitor table maintained by the active Mobility Agent.
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42. The method as recited in claim 38, wherein the Mobility Agent is a Home Agent.
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43. The method as recited in claim 38, wherein the Mobility Agent is a Foreign Agent.
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44. The method as recited in claim 38, wherein the list of registrations received comprises one or more entries from a mobility binding table maintained by the active Mobility Agent.
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45. The method as recited in claim 38, wherein the list of registrations received comprises one or more entries from a visitor table maintained by the active Mobility Agent.
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46. The method as recited in claim 38, wherein when the standby Mobility Agent assumes the role of active Mobility Agent, it adopts the virtual IP address.
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47. The method as recited in claim 38, wherein when the standby Mobility Agent assumes the role of active Mobility Agent, it adopts a virtual MAC address.
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48. A computer-readable medium storing thereon computer-readable instructions for performing a method in a standby Mobility Agent of providing Mobile IP redundancy, comprising:
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instructions for receiving a list of registrations for one or more Mobile Nodes from an active Mobility Agent on a network segment, the active Mobility Agent sharing a virtual IP address with the standby Mobility Agent;
instructions for determining that the active Mobility Agent is no longer acting as a Mobility Agent on the network segment; and
instructions for assuming the role of active Mobility Agent on the network segment for the shared virtual IP address, thereby handling the list of registrations for the one or more Mobile Nodes.
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49. A standby Mobility Agent adapted for providing Mobile IP redundancy, comprising:
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a processor; and
a memory, at least one of the processor and the memory being adapted for;
receiving a list of registrations for one or more Mobile Nodes from an active Mobility Agent on a network segment, the active Mobility Agent sharing a virtual IP address with the standby Mobility Agent;
determining that the active Mobility Agent is no longer acting as a Mobility Agent on the network segment; and
assuming the role of active Mobility Agent on the network segment for the shared virtual IP address, thereby handling the list of registrations for the one or more Mobile Nodes.
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50. A standby Mobility Agent adapted for performing a method of providing Mobile IP redundancy, comprising:
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means for receiving a list of registrations for one or more Mobile Nodes from an active Mobility Agent on a network segment, the active Mobility Agent sharing a virtual IP address with the standby Mobility Agent;
means for determining that the active Mobility Agent is no longer acting as a Mobility Agent on the network segment; and
means for assuming the role of active Mobility Agent on the network segment for the shared virtual IP address, thereby handling the list of registrations for the one or more Mobile Nodes.
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Specification