Can the policy route work with BFD and NQA ?

16

It can not support.

Other related questions:
What is NQA association mechanism of the AR router
NQA association mechanism: Association indicates that NQA provides detection and notifies the associated module of the detection result. Then the associated module processes services based on the detection result. NQA can be associated with VRRP, static route, backup interface, IGMP proxy, IP address pool, DNS server, and PBR. Static route is used as an example: A static route with the next hop address of 192.168.0.88 is configured. If the next hop address of 192.168.0.88 is reachable, the static route is valid. If the next hop address of 192.168.0.88 is unreachable, the static route is invalid. After association is configured, the static route can be determined in real time. If NQA detects that the next hop address of 192.168.0.88 is unreachable, NQA notifies the static route module. The static route module determines that the static route is invalid.

How does BFD for IS-IS work
BFD is a simple hello protocol. It is similar to the hello protocol of IS-IS in many aspects. Two devices periodically send BFD detection packets on the channel between them. If one device does not receive the detection packet from the peer within a certain period of time, the device believes that the bidirectional channel to the peer becomes faulty. IS-IS, in conjunction with BFD, can fast detect the neighboring status. In this manner, IS-IS devices can fast converge.

Working principle of BFD for IS-IS on S Series switches
Q: What is the working principle of BFD for IS-IS? A: Bidirectional Forwarding Detection (BFD) is a simple hello protocol and similar to the Hello protocol of IS-IS in many aspects. Two systems periodically send BFD detection packets on the session channel between them. If one system does not receive any BFD detection packet from its peer within a certain period of time, the system considers that the bidirectional channel to the neighboring system is faulty. IS-IS, in conjunction with BFD, can fast detect neighboring status. In this manner, IS-IS devices can fast converge routes.

Is the static route affected if the BFD for the static route is in AdminDown state
The static route is not affected. The static route is invalid only when the BFD detects a link fault.

Example for associating a static route with NQA on the AR router
Requirements: There are two egresses from the AR to the destination network segment. By default, services are transmitted through the primary egress. If the primary egress fails, services are switched to the backup egress. Because intermediate devices are deployed, the AR may not detect the fault of the intermediate link or device. In this case, services cannot be immediately switched to the backup link, causing service interruptions. The procedure for associating NQA with static route on the AR router is as follows: 1. Configure an NQA test instance of ICMP. 2. Associate the static route with the NQA test instance. Example: Associate the static route with the NQA test instance admin test. When the destination IP address is unreachable, the static route is ineffective. [HUAWEI] nqa test-instance admin test //The test instance administrator is admin. Associate the static route with the NQA test instance and the test instance name is test. The two parameters can be user-defined. [HUAWEI-nqa-admin-test] test-type icmp //Configure the NQA test instance of ICMP. [HUAWEI-nqa-admin-test] destination-address ipv4 192.168.10.1 //Configure the destination address of the NQA test instance. [HUAWEI-nqa-admin-test] frequency 10 //Configure the interval between two tests. [HUAWEI-nqa-admin-test] probe-count 2 //Configure the probe count. [HUAWEI-nqa-admin-test] start now //Start the NQA test instance immediately. [HUAWEI-nqa-admin-test] q [HUAWEI] ip route-static 10.0.0.0 255.255.0.0 192.168.0.254 track nqa admin test //sociate the static route with the NQA test instance. [HUAWEI] ip route-static 10.0.0.0 255.255.0.0 192.168.1.254 preference 80 //Configure the static route of 10.0.0.0/16 and set the priority to 80.

If you have more questions, you can seek help from following ways:
To iKnow To Live Chat
Scroll to top