Broadcast, Unknown-Unicast, and Multicast (BUM) traffic graphs for the SIX's main MTU 1500 peering VLAN are presented here.
This page gives insight into what is happening on the main peering fabric. A sort of "weather report" that shows the effects of routers coming and going along with other unexpected events. Misconfigurations may also be evident here.
With over 400 active routers, we work diligently to minimize BUM traffic since this traffic causes an unnecessary load on all routers, masks other problems, and can overload smaller circuits. We employ multiple techniques, including the requirement of 4-hour ARP/ND timer cache timeouts as able, sponging of the IP assignments of participants on hiatus or departed (AMS-IX's "arpsponge" software for IPv4, manually for IPv6), static MAC address tables to prevent flooding of packets, and the requirement that the SIX fabric not be accessible via participant networks so as to minimize remote scans which result in BUM traffic.
We routinely inform participants of ACL misconfigurations that result in excess BUM traffic.
Broadcasts are commonly indicative of IPv4 ARP requests while multicasts are commonly indicative of IPv6 Neighbor Solicitations.
The charts on this page are based on a 1 minute sampling rate.
Questions welcome at info_a_t_seattleix.net.