nanog mailing list archives
Re: Newbies Question: Do I really need to sacrifice Prefix-aggregation to do BGP Load-sharing? (the case of Multi-homed + Multi-routers + Multi-upstreams)
From: Jay Hennigan <jay () west net>
Date: Wed, 19 Oct 2022 11:32:29 -0700
On 10/18/22 23:27, Pirawat WATANAPONGSE via NANOG wrote:
Dear Guru(s), My apologies if these questions have already been asked; in that case, please kindly point me to the answer(s).I hope the following information sufficiently describes my current "context":- Single customer: ourselves - One big IPv4 block + one big IPv6 block - Native Dual-Stack, Non-tunneling - Non-transit (actually, a “multi-homed Stub”) - “All-green” IRR & RPKI registered (based on IRRexplorer report) - Fully-aggregated route announcement (based on CIDR report) - Two (Cisco) gateway routers on our side- Two upstreams (See the following lines), fully cross-connected to our gateways- One (pure) commercial ISP- One academic consortium ISP (who actually uses the above-mentioned commercial ISP as one of its upstreams as well)My current “situation”:- All inbounds “flock” in through the commercial ISP, overflowing the bandwidth; since (my guess) the academic ISP also uses that commercial ISP as its upstream, there is no way for its path to be shorter.
Many of the commercial ISPs will accept communities allowing you to fine-tune how your advertisements are propagated, some of which are quite granular. This is the best method to do so. Prepending can help but your commercial upstream will by default prefer your route as a direct customer regardless of prepending.
Onestep.net used to have a comprehensive listing of many transit providers and the communities they accept but it's returning 403 forbidden now. Ask your upstream for the communities they accept.
-- Jay Hennigan - jay () west net Network Engineering - CCIE #7880 503 897-8550 - WB6RDV
Current thread:
- Newbies Question: Do I really need to sacrifice Prefix-aggregation to do BGP Load-sharing? (the case of Multi-homed + Multi-routers + Multi-upstreams) Pirawat WATANAPONGSE via NANOG (Oct 18)
- Re: [External] Newbies Question: Do I really need to sacrifice Prefix-aggregation to do BGP Load-sharing? (the case of Multi-homed + Multi-routers + Multi-upstreams) Hunter Fuller via NANOG (Oct 18)
- Re: Newbies Question: Do I really need to sacrifice Prefix-aggregation to do BGP Load-sharing? (the case of Multi-homed + Multi-routers + Multi-upstreams) William Herrin (Oct 18)
- RE: Newbies Question: Do I really need to sacrifice Prefix-aggregation to do BGP Load-sharing? (the case of Multi-homed + Multi-routers + Multi-upstreams) Kevin Burke (Oct 19)
- Re: Newbies Question: Do I really need to sacrifice Prefix-aggregation to do BGP Load-sharing? (the case of Multi-homed + Multi-routers + Multi-upstreams) Jay Hennigan (Oct 19)
- Re: Newbies Question: Do I really need to sacrifice Prefix-aggregation to do BGP Load-sharing? (the case of Multi-homed + Multi-routers + Multi-upstreams) Douglas Fischer (Oct 19)