Shared pending interest table in a content centric network
View Patent ↗One embodiment provides a pending interest table (PIT) sharing system that facilitates sharing of a PIT. During operation, the system receives, by a local interface, a first message comprising an interest from a node of origin. The hop count for the interest has not been decreased. The system creates an entry, which includes a name of the interest, in a PIT for the interest. If the system receives a content object associated with the name, the system retrieves and removes the entry from the PIT, and sends the content object to the node of origin in a second message.
1. A computer-implemented method performed in a content-centric network, comprising:
receiving, by a local interface, a first message comprising an interest from a node of origin, wherein a hop count for the interest has not been decreased;
creating an entry in a proxy pending interest table (PIT) for the interest, wherein the entry comprises a name of the interest, and wherein the proxy PIT is distinct from a local PIT for interests from a locally coupled device; and
in response to receiving a content object associated with the name,
retrieving and removing the entry from the proxy PIT; and
sending the content object to the node of origin in a second message.
2. The method of claim 1 , wherein the name of the interest is based on one or more of:
a hierarchically structured variable-length identifier (HSVLI), which comprises contiguous name components ordered from a most general level to a most specific level, wherein the HSVLI is applicable in a portal instance corresponding to the stack;
a flat name that does not indicate any hierarchy;
a role of the component of the stack; and
a unique identifier, which is specific to the component of the stack.
3. The method of claim 1 , wherein the first and second messages further comprise an interface of origin indicating an interface via which the node of origin has received the interest; and
wherein the entry further comprises an identifier of the interface of origin.
4. The method of claim 3 , wherein the proxy PIT is dedicated for interests from the node of origin.
5. The method of claim 3 , wherein the entry further comprises an identifier of a tunnel interface of a tunnel coupling the node of origin.
6. The method of claim 1 , wherein the first and second messages are tunnel-encapsulated messages, and wherein a respective interface of origin is associated with an individual tunnel.
7. The method of claim 1 , wherein the interest from the node of origin is distinguished from interests from a locally coupled device based on distinct namespaces.
8. A non-transitory computer-readable storage medium storing instructions that when executed by a computer cause the computer to perform a method performed in a content-centric network, the method comprising:
receiving, by a local interface, a first message comprising an interest from a node of origin, wherein a hop count for the interest has not been decreased;
creating an entry in a proxy pending interest table (PIT) for the interest, wherein the entry comprises a name of the interest, and wherein the proxy PIT is distinct from a local PIT for interests from a locally coupled device; and
in response to receiving a content object associated with the name,
retrieving and removing the entry from the proxy PIT; and
sending the content object to the node of origin in a second message.
9. The storage medium of claim 8 , wherein the name of the interest is based on one or more of:
a hierarchically structured variable-length identifier (HSVLI), which comprises contiguous name components ordered from a most general level to a most specific level, wherein the HSVLI is applicable in a portal instance corresponding to the stack;
a flat name that does not indicate any hierarchy;
a role of the component of the stack; and
a unique identifier, which is specific to the component of the stack.
10. The storage medium of claim 8 , wherein the first and second messages further comprise an interface of origin indicating an interface via which the node of origin has received the interest; and
wherein the entry further comprises an identifier of the interface of origin.
11. The storage medium of claim 10 , wherein the proxy PIT is dedicated for interests from the node of origin.
12. The storage medium of claim 11 , wherein the entry further comprises an identifier of a tunnel interface of a tunnel coupling the node of origin.
13. The storage medium of claim 8 , wherein the first and second messages are tunnel-encapsulated messages, and wherein a respective interface of origin is associated with an individual tunnel.
14. The storage medium of claim 8 , wherein the interest from the node of origin is distinguished from interests from a locally coupled device based on distinct namespaces.
15. A computer system for facilitating forwarding of packets in a content-centric network, the system comprising:
a processor; and
a storage device storing instructions that when executed by the processor cause the processor to perform a method, the method comprising:
receiving, by a local interface, a first message comprising an interest from a node of origin, wherein a hop count for the interest has not been decreased;
creating an entry in a proxy pending interest table (PIT) for the interest, wherein the entry comprises a name of the interest, and wherein the proxy PIT is distinct from a local PIT for interests from a locally coupled device; and
in response to receiving a content object associated with the name,
retrieving and removing the entry from the proxy PIT; and
sending the content object to the node of origin in a second message.
16. The computer system of claim 15 , wherein a name of the interest is based on one or more of:
a hierarchically structured variable-length identifier (HSVLI), which comprises contiguous name components ordered from a most general level to a most specific level, wherein the HSVLI is applicable in a portal instance corresponding to the stack;
a flat name that does not indicate any hierarchy;
a role of the component of the stack; and
a unique identifier, which is specific to the component of the stack.
17. The computer system of claim 15 , wherein the first and second messages further comprise an interface of origin indicating an interface via which the node of origin has received the interest; and
wherein the entry further comprises an identifier of the interface of origin.
18. The computer system of claim 17 , wherein the proxy PIT is dedicated for interests from the node of origin.
19. The computer system of claim 17 , wherein the entry further comprises an identifier of a tunnel interface of a tunnel coupling the node of origin.
20. The computer system of claim 15 , wherein the interest from the node of origin is distinguished from interests from a locally coupled device based on distinct namespaces.