Can WRED be configured on all types of routers

WRED (Weighted Random Early Detection) cannot be configured on all types of routers. Here are some key points about WRED configuration and compatibility:

1. Core routers: WRED is typically implemented on core routers of a network where congestion is expected to occur[1][2].
2. Output interfaces: WRED is usually configured on output interfaces where congestion is anticipated[1].
3. Router types: Not all router models support WRED. It’s more commonly found on enterprise-grade and service provider routers.
4. Cisco support: Many Cisco router series support WRED configuration, including the Cisco Cloud Services Router 1000V Series[1].
5. Switch limitations: Some switches have limited or no support for WRED. For example, WRED ECN is not supported on Nexus 5000 series switches[2].
6. Interface considerations: When configuring WRED on Cisco Nexus devices, you may need to set WRED thresholds for different interface speeds (e.g., 10G and 40G) even if those interfaces are not present[2].
7. QoS integration: WRED is often integrated with Quality of Service (QoS) features. On some platforms, WRED cannot be configured alone on a QoS group without Explicit Congestion Notification (ECN)[2].
8. Traffic types: WRED is most effective with adaptive traffic such as TCP/IP. It may be less useful for non-adaptive protocols that don’t respond to packet drops by reducing transmission rates[1].

When considering WRED implementation, it’s essential to check your specific router model’s documentation and capabilities to ensure compatibility and proper configuration options.

Citations:
[1] https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/qos_conavd/configuration/xe-16/qos-conavd-xe-16-book/qos-conavd-cfg-wred.html
[2] https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5600/sw/qos/7x/b_5600_QoS_Config_7x/wred_explicit_congestion_notification.pdf
[3] https://www.nytimes.com/wirecutter/blog/modem-vs-router/
[4] https://www.ciscopress.com/articles/article.asp?p=352991&seqNum=8
[5] https://www.reddit.com/r/HomeNetworking/comments/wz93zx/is_a_new_router_just_plug_and_play/
[6] https://www.nytimes.com/wirecutter/reviews/best-wi-fi-router/
[7] https://www.cisco.com/c/en/us/solutions/small-business/resource-center/networking/types-of-routers.html
[8] https://forum.networklessons.com/t/wred-weighted-random-early-detection/5130