I’m playing with BGP ECMP to load traffic across our load-balancers and I’ve hit a problem that I do not know how to solve. Internally everything works fine, but I’m unable to present Public IP on the uplinks of Core Edge Routers.
I will mention that I do not have MGMT access to Core Edge Routers – those are routers of our ISP.
WDC02-SC3-03A-C35-AGG-SW01#show ip bgp
Network Next Hop Metric LocPref Weight Path
Thing is that our Public IPs is provided to us as Access Port:
WDC02-SW01#show running-config interfaces Port-Channel 999
What I was able to do and this was for testing purposes is this hacky way to be able to reach IP from the outside:
After this, once Core Edge Routers learn the IP I am able to reach Public IP: 220.127.116.11/26 for around 20-30min (I guess it’s arp aging time on edge routers)
I know Private BGP between Me and ISP would solve the problem but, case is this switch should have set default GW to our Firewall (NAT).
WDC02-SW01#show ip route
Gateway of last resort:
Is there is any way to somehow spoof this IP on Uplink interface so that Edge Routers would know where to forward traffic for 18.104.22.168/26 ?
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