System and method for facilitating communication

• US 9,853,891 B2
• Filed: 03/02/2012
• Issued: 12/26/2017
• Est. Priority Date: 03/02/2012
• Status: Expired due to Fees

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Hammer, Michael P., Dalela, Ashish, Morrow, Monique J., Tomsu, Peter C.
• Primary Examiner(s): Towfighi, Afshawn
• Assistant Examiner(s): AMBAYE, MEWALE A
• Application Number:
  US13/410,525
• Publication Number:
  US 20130230053A1
• Time in Patent Office: 2,125 Days
• Field of Search: 370401
• CPC Class Codes: H04L 45/54 Organization of routing tables
• CPC Class Codes: H04L 61/103 across network layers, e.g. resolution of network layer into physical layer addresses or address resolution protocol [ARP]
• CPC Class Codes: H04L 63/1441 Countermeasures against malicious traffic countermeasures against attacks on cryptographic mechanisms H04L9/002

Abstract

According to one embodiment, a system includes one or more memory units for storing an Address Resolution Protocol (ARP) table. The system further includes one or more processors. The processors receive, from a routing protocol, an Internet Protocol (IP)-Media Access Control (MAC) address pair for a first host computer. The processors further populate the ARP table with the IP-MAC address pair for the first host computer.

Claims

1. A system comprising:

an access switch comprising;

one or more memory units configured to store an Address Resolution Protocol (ARP) table and a routing protocol table; and

one or more processors operably coupled to the one or more memory units, wherein the one or more memory units store instructions that configure the one or more processors to;

receive, from the routing protocol table, an Internet Protocol (IP)-Media Access Control (MAC) address pair for a first host computer, the first host computer being a different component from the access switch; and

populate the ARP table with the IP-MAC address pair for the first host computer;

wherein the routing protocol comprises a protocol that allows switches to share network topology information between themselves;

wherein the one or more processors are further configured to;

receive an ARP query from a second host computer, the ARP query requesting the MAC address for the first host computer, the second host computer connected to the access switch; and

based on the ARP table, transmit the MAC address for the first host computer to the second host computer;

wherein the routing protocol comprises one of Intermediate System to Intermediate System (IS-IS) routing protocol, Interior Gateway Routing Protocol (IGRP), Enhanced Interior Gateway Routing Protocol (EIGRP), OpenShortest Path FIRST (OSPF), and Routing Information Protocol (RIP); and

wherein the one or more processors only receive IP-MAC address pairs, from the routing protocol, for one or more host computers that are coupled to a particular subset of network segments.

2. The system of claim 1, wherein the one or more processors are further configured to populate the routing protocol table stored in the one or more memory units with the IP-MAC address pair for the first host computer.

3. The system of claim 1, wherein the system comprises a second access switch connected to the first host computer.

4. The system of claim 1, wherein the one Or more processors are further configured to:

receive, from the routing protocol table, an updated IP-MAC address pair for the first host computer; and

populate the ARP table with the updated IP-MAC address pair for the first host computer.

5. A method comprising:

storing, by one or more memory units of an access switch coupled to one or more processors of the access switch, an Address Resolution Protocol (ARP) table and a routing protocol table;

receiving, by the one Or more processors and from Ran the routing protocol table, an Internet Protocol (IP)-Media Access Control (MAC) address pair for a first host computer, the first host computer being a different component from the access switch; and

populating, by the one or more processors, the ARP table with the IP-MAC address pair for the first host computer;

wherein a routing protocol comprises a protocol that allows switches to share network topology information between themselves; and

further comprising;

receiving, by the one or more processors, an ARP query from a second host computer, the ARP query requesting the MAC address for the first host computer, the second host computer connected to the access switch; and

based on the ARP table, transmitting, by the one or more processors, the MAC address for the first host computer to the second host computer;

wherein the routine protocol comprises one of Intermediate System to Intermediate System (IS-IS) routing protocol, Interior Gateway Routing Protocol (TGRP) Enhanced Interior Gateway Routing Protocol (EIGRP), Open Shortest Path First (OSPF), and Routing Information Protocol (RIP); and

wherein the one or more processors only receive IP-MAC address pairs, from the routine protocol, for one or more host computers that are coupled to a particular subset of network segments.

6. The method of claim 5, further comprising populating, by the one or more processors, the routing protocol table stored in the one or more memory units with the IP-MAC address pair for the first host computer.

7. The method of claim 5, wherein the second host computer is connected to a second access switch.

8. The method of claim 5, further comprising:

receiving, by the one or more processors and from the routing protocol table, an updated IP-MAC address pair for the first host computer; and

populating, by the one or more processors, the ARP table with the updated IP-MAC address pair for the first host computer.

9. Logic encoded on one or more non-transitory computer-readable media for execution and when executed by a computer processor configured to:

store an Address Resolution Protocol (ARP) table and a routing protocol table in one or more memory units;

receive, from the routing protocol table, an Internet Protocol (IP)-Media Access Control (MAC) address pair for a first host computer; and

populate the ARP table with the IP-MAC address pair for the first host computer;

wherein a routing protocol comprises a protocol that allows switches to share network topology information between themselves;

wherein the logic is further configured when executed to;

receive an ARP query from a second host computer, the ARP query requesting, the MAC address for the first host computer; and

based on the ARP table, transmit the MAC address for the first host computer to the second host computer;

wherein the logic is executed by one or more processors of an access switch, the first host computer being a different component from the access switch and the second host computer connected to the access switch;

wherein the routing protocol comprises one of Intermediate System to Intermediate System (IS-IS) routing protocol, Interior Gateway Routing Protocol (IGRP), Enhanced Interior Gateway Routing Protocol (EIGRP), Open Shortest Path First (OSPFh and Routing Information Protocol (RIP); and

wherein the one of more processors only receive IP-MAC address pairs, from the routing protocol, for one or more host computers that are coupled to a particular subset of network segments.

10. The logic of claim 9, wherein the logic is further configured when executed by a computer processor to populate the routing protocol table stored in the one or more memory units with the IP-MAC address pair for the first host computer.

11. The logic of claim 9, wherein the second host computer is connected to a second access switch.

12. The logic of claim 9, wherein the logic is further configured when executed by a computer processor to:

receive, from the routing protocol table, an updated IP-MAC address pair for the first host computer; and

populate, the ARP table with the updated IP-MAC address pair for the first host computer.