& nbsp;

 

Outbound LLB integrates with NAT Port(Dynamic NAT) to route traffic from internal network(s) to external network(s) through 2 or more external links. Internal clients push traffic to the inside NIC and LLB routes the traffic out accordingly base on the preset method(rr , wrr, dd, or sr ). Example: C1 -> xyz.com    LLB routes traffic to the isp1 link using NAT VIP 10.7.9.41 - 42. C2 -> abc.com   LLB routes traffic to the isp2 link using NAT VIP 10.7.7.41 - 42.   LLB is implemented at L3 (the IP layer), connection persistence is based on src:dst IP pair. Default persistence timeout is 60 second. Timeout value can be changed using "nat port" command.

5. LLB Setup

# Enable statistic

llb link statistics on

# Enable health check

llb link health on

# Create and enable the links to ISP gateways 10.7.9.1 and 10.7.7.1

#Notice that the gateways also used for icmp healthcheck.

llb link route "ISP1_net9" 10.7.9.1

llb link enable "ISP1_net9"

llb link health checker icmp "ISP1_net9" "10.7.9.1"

llb link route "ISP2_net7" 10.7.7.1

llb link enable "ISP2_net7"

llb link health checker icmp "ISP2_net7" "10.7.7.1"

# Method (rr , wrr, sr , or dd)

#by default, method is rr .

# if llb method is rr, it won’t show in config.

# to change method sr, use “llb method outbound sr”

6. Check statistic