1. An electronic device, comprising:
a chassis having a bottom wall, a rear wall, and a sidewall;
a motherboard disposed on the bottom wall, and a riser card perpendicularly connected to the motherboard;
an expansion card parallel to the motherboard and inserted in the riser card, the expansion card having a first end and a second end, and the first end being secured to the rear wall;
an airflow duct located on the bottom wall of the chassis; and
a securing member mounted to the airflow duct, the securing member comprising a securing portion to accommodate the second end of the expansion card and limit a movement of the expansion card along a direction substantially perpendicular to the chassis bottom wall, and a blocking portion that prevents movement of the expansion card away from the riser card.
2. The electronic device of claim 1, wherein a fan mounting bracket is mounted on the bottom wall, and the airflow duct abuts the fan mounting bracket to conduct air flow toward the rear wall of the chassis.
3. The electronic device of claim 1, wherein the securing member comprises a base, the securing portion is located at one side of the base adjacent to the chassis sidewall, and the blocking portion is located at the other side of the base away from the chassis sidewall.
4. The electronic device of claim 3, wherein the securing portion comprises at least one supporting portion and a limiting portion, the supporting portion and the limiting portion cooperatively define a receiving slot, and the second end of the expansion card is accommodated in the receiving slot.
5. The electronic device of claim 3, wherein the blocking portion of the securing member comprises an elastic arm and a blocking protrusion, a side edge of the expansion card is blocked by the blocking protrusion.
6. The electronic device of claim 3, wherein the airflow duct comprises a mounting wall parallel to the chassis rear wall, and the securing member is secured to the mounting wall.
7. The electronic device of claim 6, wherein the base of the securing member abuts the mounting wall, and two securing posts protrude from the base and engage two securing holes in the mounting wall.
8. An electronic device, comprising:
a chassis having a bottom wall, a rear wall, and a sidewall;
a motherboard disposed on the bottom wall, and a riser card perpendicularly connected to the motherboard;
an expansion card parallel to the motherboard and inserted in the riser card, the expansion card having a first end and a second end; and
an airflow duct located on the bottom wall of the chassis, the airflow duct comprising a mounting wall parallel to the chassis rear wall, the first end of the expansion card being secured to the rear wall, and the second end of the expansion card being mounted to the mounting wall of the airflow duct.
9. The electronic device of claim 8, wherein a fan mounting bracket is mounted on the bottom wall, and the airflow duct abuts the fan mounting bracket to conduct air flow toward the rear wall of the chassis.
10. The electronic device of claim 8, wherein a securing member is mounted to the mounting wall of the airflow duct, the securing member comprising a securing portions to accommodate the second end of the expansion card and limit a movement of the expansion card along a direction perpendicular to the chassis bottom wall, and a blocking portion located on the securing member to prevent a movement of the expansion card along a direction away from the riser card.
11. The electronic device of claim 10, wherein the securing member comprises a base, the securing portions are located at one side of the base adjacent to the chassis sidewall, and the blocking portion is located at the other side of the base away from the chassis sidewall.
12. The electronic device of claim 10, wherein the securing portions comprises at least one supporting portion and a limiting portion, the supporting portion and the limiting portion cooperatively define a receiving slot, and the second end of the expansion card is accommodated in the receiving slot.
13. The electronic device of claim 10, wherein the blocking portion of the securing member comprises an elastic arm and a blocking protrusion, a side edge of the expansion card is blocked by the blocking protrusion.
14. The electronic device of claim 11, wherein the base of the securing member abuts the mounting wall, and two securing posts protrude from the base and engage two securing holes in the mounting wall.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method for recovering network routing in a communication network, comprising:
recovering a first network element (\u201cNE\u201d) from an earlier device failure;
establishing a first link configured to transmit data packets between the first NE and a network device;
establishing a second link configured to transmit data packets between the first NE and a second NE;
initiating a discovery process utilizing network reachability protocol to identify a plurality of routing paths associated with the first NE;
updating a routing table in the first NE in accordance with the plurality of routing paths; and
issuing a ready message from the first NE to the network device when the routing table is at least partially completed.
2. The method of claim 1, further comprising,
detecting an error associated with the first NE;
shutting down the first NE for error recovery; and
switching network services from the first NE to a backup NE.
3. The method of claim 2, further comprising:
receiving a data packet from the network device to the first NE; and
routing the data packet to its destination node in accordance with the routing table.
4. The method of claim 1, wherein recovering a first NE from an earlier device failure includes resuming routing function from halting status.
5. The method of claim 1, wherein establishing a first link configured to transmit data packets between the first NE and a network device includes restoring a connection for data transfer between a first router and an access switch.
6. The method of claim 5, wherein establishing a second link configured to transmit data packets between the first NE and a second NE includes repairing a network connection between the first router and a second router.
7. The method of claim 1, wherein initiating a discovery process utilizing network reachability protocol to identify a plurality of routing paths associated with the second link includes learning alternative routing paths between the first NE and other nodes.
8. The method of claim 1, wherein updating a routing table in the first NE in accordance with the plurality of routing paths includes recording the routing paths in the routing table which is used for routing data packets.
9. The method of claim 1, wherein issuing a ready message from the first NE to the network device when the routing table is at least partially completed includes informing an access switch to revert from a backup NE to the first NE for subsequent network services.
10. A method of system communication, comprising: rebooting a control card of a primary network element (\u201cNE\u201d) from an earlier system failure;
activating a network discovery process to identify a plurality of routing paths between the primary NE and a destination node;
reconstructing a routing table resided in the primary NE in accordance with the plurality of routing paths; and
reverting routing service from a backup NE to the primary NE when the routing table is at least partially completed.
11. The method of claim 10, further comprising:
resuming a first link configured to transmit data packets between the primary NE and the access switch; and
resuming a second link configured to transmit data packets between the primary NE and a secondary NE.
12. The method of claim 11, further comprising:
identifying an error during network communication between the primary NE and an access switch;
temporary shutting down the primary NE for error recovery; and
switching network service from the primary NE to a backup NE.
13. The method of claim 12,
receiving a data packet from the access switch to the primary NE; and
routing the data packet to a radio network controller (\u201cRNC\u201d) in accordance with the routing table.
14. The method of claim 10, wherein reverting routing service from a backup NE to the primary NE includes sending a ready message to an access switch in accordance with a plurality of Internet Protocol (\u201cIP\u201d) routes in virtual routing and forwarding.
15. The method of claim 10, wherein reverting routing service from a backup NE to the primary NE includes sending a ready message to an access switch in accordance with a plurality of media access control (\u201cMAC\u201d) addresses in the routing table.
16. The method of claim 10, wherein reverting routing service from a backup NE to the primary NE includes sending a ready message to an access switch in accordance with a plurality of selected label switched paths (\u201cLSPs\u201d) in the routing table.
17. A network, comprising:
a network device configured to control connections of network systems situated at edge of a communication network for handling data transmission;
a backup router coupled to the network device and configured to provide backup routing service for the network device when primary routing service is not available;
a primary router coupled to the access switch for providing the primary routing service and having a delay-switching circuit, wherein the delay-switching circuit is configured to delay a switchover from the backup router to the primary router when the primary router is in a process of learning Internet protocol (\u201cIP\u201d) routing paths.
18. The network of claim 17, further comprising:
a first pseudo wire emulation (\u201cPWE\u201d) is established between the network device and the primary router for the primary routing service; and
a second PWE is established between the network device and the backup router for the backup routing service.
19. The network of claim 17, wherein the delay-switching circuit is capable of delaying a switchover of network service in response to a plurality of media access control (\u201cMAC\u201d) addresses in the routing table.
20. The network of claim 19, wherein the delay-switching circuit is capable of delaying a switchover of network service in response to a plurality of selected label switched paths (\u201cLSPs\u201d) in the routing table.