On Mon, 31 Aug 2015, Jason Berenson wrote:
Was interested in getting any pointers anyone might have about multihoming.
I've got an ASN and am working on a /24 from ARIN now. I was thinking about
a pair of Cisco 3560's one for each provider and I was going to take default
routes from each, one with a higher metric and announce my prefix over the
primary link and pad the secondary link. No customer or full tables needed.
I was thinking about vlan'ing each switch into half public half private side
also. Any pointers or tips or recommendations would be greatly appreciated.
It's been a while since doing this type of stuff.
You might need to get your IPv4 space from one of your upstream providers.
As far as ARIN is concerned, that well is dry.
You will also want to start giving serious thought to IPv6.
I don't know how well 3560s handle BGP, but if you're just taking default
routes from your upstreams, the resource needs are pretty light. As the
other person who responded mentioned - 4-byte ASNs could be an issue as
well.
You can accept the default route from provider A with a default
local-preference and the one from provider B with a lower local-pref. For
outbound advertisements, as you mentioned, you can prepend your AS a few
times on your announcement to provider B. You'll also want to run IBGP
between the two 3560s.
When you say "half public, half private", can you clarify what you're
trying to do?
jms
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