Generating a host route

Patent metadata

Field	Value
Publication number	US-2016014025-A1
Application number	US-201414768186-A
Country	US
Kind code	A1
Filing date	Mar 14, 2014
Priority date	Mar 14, 2013
Publication date	Jan 14, 2016
Grant date	—

Abstract

According to an example, in a method for generating a host route, a host route entry may be generated based on an IP address of a virtual machine, and an update message carrying a host route of the host route entry may be sent to an IBGP peer.

First claim

What is claimed is:

1 . A method for generating a host route, comprising:
generating a host route entry based on an IP address of a virtual machine; an IP address prefix of a host route in the host route entry and a length of the IP address prefix are respectively the IP address of the virtual machine and a length of the IP address; sending an update message to an internal border gateway protocol, IBGP, peer; the update message comprises a host route of the host route entry.

2 . The method according to claim 1 , further comprising:
receiving a check message came from the IBGP peer; checking the reachability of a host route in the check message.

3 . The method according to claim 1 , further comprising:
sending a first withdraw message to the IBGP peer; the first withdraw message comprises an IP address prefix of an unreachable host route and a length of the IP address prefix.

4 . The method according to claim 1 , further comprising:
deleting the host route entry; sending a second withdraw message to the IBGP peer; the second withdraw message comprises an IP address prefix of a host route in deleted host route entry and a length of the IP address prefix.

5 . The method according to claim 1 , further comprising:
receiving a general route encapsulation, GRE, tunnel packet came from the IBGP peer; decapsulating the GRE tunnel packet into an IP packet; forwarding the IP packet according to a next-hop in a host route entry corresponding to a destination IP address of the IP packet.

6 . A device for generating a host route, comprising:
a route controlling unit, to generate a host route entry based on an Internet Protocol (IP) address of a virtual machine; and generate an update message carrying a host route of the host route entry; wherein an IP address prefix of the host route and a length of the IP address prefix are respectively the IP address of the virtual machine and a length of the IP address; and a forwarding unit, to store the host route entry, and send the update message to an internal border gateway protocol (IBGP) peer.

7 . The device according to claim 6 , wherein,
the forwarding unit is to receive a check message came from the IBGP peer; and the route controlling unit is to check the reachability of a host route in the check message.

8 . The device according to claim 6 , wherein,
the route controlling unit is to generate a first withdraw message comprising an IP address prefix of an unreachable host route and a length of the IP address prefix; the forwarding unit is to send the first withdraw message to the IBGP peer.

9 . The device according to claim 6 , wherein,
the route controlling unit is to delete the host route entry stored in the forwarding unit; and generate a second withdraw message comprising an IP address prefix of the host route corresponding to the deleted host route entry and a length of the IP address prefix; the forwarding unit is to send the second withdraw message to the IBGP peer.

10 . The device according to claim 6 , wherein,
the forwarding unit is to receive a general route encapsulation, GRE, tunnel packet from the IBGP peer; decapsulate the GRE tunnel packet into an IP packet; find a host route entry according to a destination IP address of the IP packet, and forward the IP packet according to a next-top in found host route entry.

11 . A method for generating a host route, comprising:
receiving at a device a update message from an internal border gateway protocol (IBGP) peer; searching in a route table of the device for a host route entry matching with an IP address prefix of a host route in the update message and a length of the IP address prefix in the update message;
in response to not finding a host route entry matching a host route in the update message, generating a host route entry according to the host route in the update message, and configuring a next-hop in the host route entry to be a General Routing Encapsulation (GRE) tunnel connecting the device with the IBGP peer.

12 . The method according to claim 11 , further comprising:
in response to finding a host route entry matching with an IP address prefix of a host route in the update message and a length of the IP address prefix in a route table, and determining that the next-hop in the host route entry differs from the GRE tunnel connecting the IBGP peer, amending a next-hop in the host route entry to a GRE tunnel connecting the IBGP peer with the device, configuring a to-be-checked identifier; and sending a check message to a previous next-top of the host route entry configured with the to-be-checked identifier; the check message comprises an IP address prefix of a host route in the host route entry configure with the to-be-checked identifier and a length of the IP address prefix.

13 . The method according to claim 12 , further comprising:
receiving a first withdraw message from the previous next-hop, the first withdraw message comprises an IP address prefix of an unreachable host route and a length of the IP address prefix; searching for and finding the host route entry configured with the to-be-checked identifier according to the IP address prefix of the unreachable host route and the length of the IP address prefix; and deleting the to-be-checked identifier.

14 . The method according to claim 11 , further comprising:
receiving a second withdraw message came from the IBGP peer; deleting a host route entry matching with an IP address prefix of a host route carried in the second withdraw message and a length of the IP address prefix.

15 . The method according to claim 11 , further comprising:
receiving an IP packet; searching for and finding a host route entry according to a destination IP address of the IP packet; encapsulating the IP packet into a GRE tunnel packet according to a GRE tunnel interface of the next-top in the found host route entry; sending the GRE tunnel packet to the IBGP peer.

16 . A device for generating a host route, comprising:
a forwarding unit to receive an update message came from an Internet Border Gateway Protocol (IBGP) peer; and a host route unit to, when a host route entry matching with an Internet Protocol (IP) address prefix of a host route in the update message and a length of the IP address prefix is not found from a route table in the forwarding unit, generate a host route entry and store the host route entry in the route table in the forwarding unit; wherein a host route in the generated host route entry is the host route in the update message, and the next-top in the generated host route entry is a GRE tunnel connecting the device with the IBGP peer.

17 . The device according to claim 16 , wherein,
the host route unit is to, when a host route entry matching with an IP address prefix of a host route in the update message and a length of the IP address prefix is found from a route table in the forwarding unit and a next-top in the host route entry differs from the GRE tunnel connecting the device with the IBGP peer, amend the next-top in the host route entry to a GRE tunnel connecting the IBGP peer, configure a to-be-checked identifier, and generate a check message according to an IP address prefix of the host route entry configure with the to-be-checked identifier and a length of the IP address prefix; the forwarding unit is to send the check message to a previous next-top of the host route entry configured with the to-be-checked identifier.

18 . The device according to claim 17 , wherein,
the forwarding unit is further to receive a

Assignees

• Hangzhou H3C Tech Co Ltd

Inventors

• Wang Feng

Classifications

• H04L45/033

  by updating distance vector protocols · CPC title

• H04L61/2007

  Electricity · mapped topic

• H04L45/64

  using an overlay routing layer · CPC title

• H04L12/4633

  Interconnection of networks using encapsulation techniques, e.g. tunneling · CPC title

• H04L67/148

  Migration or transfer of sessions · CPC title