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Sudo iptables -t mangle -I INPUT -j NFLOG $MOD_STATISTIC $NFLOG_CONFIG Sudo iptables -t mangle -I POSTROUTING -j NFLOG $MOD_STATISTIC $NFLOG_CONFIG
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NFLOG_CONFIG="-nflog-group 5 -nflog-prefix SFLOW" In order to correctly sample egress packets on the Cumulus VX, we need to enable nflog sampling at a rate of 1 in 1000 packets using iptables post-routing rules as follows: MOD_STATISTIC="-m statistic -mode random -probability 0.001" Nexthop codes: nexthop's vrf id, 172.16.0.0 200 0 33010 i Detours & Detours Ahead United States Headquarters 1280 West Peachtree Street NW Atlanta, GA 30309 1.800.634.6032 Canadian Headquarters 233 Lahr Drive Belleville, ON K8N 5S2 1.800.267.2149 ext.52128 Brazilian Headquarters Av. I internal, r RIB-failure, S Stale, R Removed Status codes: s suppressed, d damped, h history, * valid, > best, = multipath, Neighbor 172.16.0.2 soft-reconfiguration inboundīelow is a snippet from the route table of the Cumulus VX, which shows the same route being announced from both neighbors, while the route to the peer being preferred: net show bgpīGP table version is 239, local router ID is 50.50.50.50, vrf id 0 Neighbor 172.16.0.0 soft-reconfiguration inbound Neighbor 10.1.4.100 description CONTROLLER Below is a BGP configuration snippet from the Cumulux VX: router bgp 12121 This device will also establish an iBGP peering session with the controller and will announce additional all paths to it (while retaining the external next hops). The vQFX will be configured to announce the same routes across both BGP sessions to the Cumulux which will then be configured to prefer the route over the “peering” link as opposed to the “transit” link. These prefixes will be installed as sink routes with a discard ( or null0) next hop which means the UDP traffic to these destinations is simply going to get dropped. Recall that the Juniper vQFX is setup as a peer router in our topology and is configured to announce several random prefixes such as 1.0.0.0/24, 1.0.1.0/24 etc to the downstream Cumulus VX. To recap, this is what our topology looks like: Though Homers rhetorical turns sometimes take odd detours. We will also look into other real world considerations such as operational monitoring and metrics. With high quality text-to-speech and a configurable user interface, Voice Dream Reader makes. In this blog, I will try to demonstrate the controller in action by simulating traffic flows using our virtualized topology. Please inquire at 51 for a custom quote.In Part 1 of this series, we ran through the technical details of what it would take to build an edge traffic controller to steer traffic away from overloaded edge links.
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