Table of Contents
Question
What is the default value for the Multiplier field of the BFD basic configuration in vManage?
A. 3
B. 4
C. 5
D. 6
Answer
A. 3
Explanation
The correct answer for the question is A. 3. Here is the explanation:
BFD (Bidirectional Forwarding Detection) is a protocol that provides fast detection of link failures between two routers. BFD can be configured on Cisco SD-WAN devices to monitor the connectivity of WAN links and tunnels.
The BFD basic configuration in vManage consists of four parameters: Interval, Multiplier, Hold Down Time, and Detection Time. The Interval parameter specifies the interval between BFD packets sent by a router. The Multiplier parameter specifies the number of consecutive BFD packets that a router can miss before declaring the link down. The Hold Down Time parameter specifies the minimum time that a router must wait before bringing up a BFD session after a link failure. The Detection Time parameter specifies the calculated time that a router must wait before declaring the link down, which is equal to the Interval multiplied by the Multiplier.
The default value for the Interval parameter is 1000 milliseconds, which means that a router sends a BFD packet every 1 second. The default value for the Multiplier parameter is 3, which means that a router can miss up to 3 BFD packets before declaring the link down. Therefore, the default value for the Detection Time parameter is 3000 milliseconds, which means that a router must wait for 3 seconds before declaring the link down.
The default values for the BFD basic configuration in vManage can be modified to suit different network scenarios and requirements. For example, if a faster detection of link failures is needed, the Interval and Multiplier parameters can be reduced to lower the Detection Time. However, this may also increase the chance of false positives due to network congestion or packet loss. Therefore, it is important to balance the trade-off between fast detection and reliability when configuring BFD on Cisco SD-WAN devices.
Reference
- Cisco SD-WAN Routing Configuration Guide, Cisco IOS XE Release 17.x – Cisco SD-WAN BFD [Cisco SD-WAN] – Cisco
- Cisco vManage How-Tos for Cisco IOS XE SD-WAN Devices – Configuration [Cisco SD-WAN] – Cisco
- Cisco Content Hub – Protocols in Cisco SD-WAN
- Policies Configuration Guide for vEdge Routers, Cisco SD-WAN Release 20 – Application-Aware Routing [Cisco SD-WAN] – Cisco
- BFD Commands – Cisco
- multiplier (BFD Liveness Detection) | Junos OS | Juniper Networks
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