nanog mailing list archives
Re: "Tactical" /24 announcements
From: Jon Lewis <jlewis () lewis org>
Date: Wed, 11 Aug 2021 09:09:59 -0400 (EDT)
On Wed, 11 Aug 2021, Tom Hill wrote:
On 10/08/2021 07:15, Lukas Tribus wrote:Are there any big networks that drop or penalize announcements like this?It's possible you could get your peering request denied for this. I have put *reasonable* prefix aggregation into peering requirements for some years now. If you are a small eyeball network with 8192 IP addresses and originate 32 /24's, that is *not* reasonable.It is quite an issue when a network tries to programmatically filter-out the /24 more-specifics advertisements made from an allocated, .e.g, /20. Such anti-disaggregation/save-my-TCAM efforts really do not work, and will spawn all manner of support tickets. I'm saying this in the hope that it may prevent someone from reading this thread and concluding that it may be a good idea to try. It is not.
What sort of hands-on experience is this opinion based on?I've done this manually in the past (quite some time ago), and done properly, it works fine.
At least one major network hardware vendor has implemented it as a feature. Turn it on, and the "deaggregates" with same next-hop as an aggregate are not programmed into the FIB. The savings will vary depending on the device's connectivity, but I've seen >40%.
---------------------------------------------------------------------- Jon Lewis, MCP :) | I route StackPath, Sr. Neteng | therefore you are _________ http://www.lewis.org/~jlewis/pgp for PGP public key_________
Current thread:
- Re: "Tactical" /24 announcements, (continued)
- Re: "Tactical" /24 announcements Tom Hill (Aug 11)
- Re: "Tactical" /24 announcements Mark Tinka (Aug 11)
- Re: "Tactical" /24 announcements Chris Cummings (Aug 09)
- Re: "Tactical" /24 announcements Grzegorz Janoszka (Aug 09)
- Re: "Tactical" /24 announcements Baldur Norddahl (Aug 09)
- Re: "Tactical" /24 announcements Robert McKay (Aug 09)
- Re: "Tactical" /24 announcements Lady Benjamin Cannon of Glencoe, ASCE (Aug 09)
- Re: "Tactical" /24 announcements Baldur Norddahl (Aug 09)
- Re: "Tactical" /24 announcements Tom Hill (Aug 11)
- Re: "Tactical" /24 announcements Lukas Tribus (Aug 11)
- Re: "Tactical" /24 announcements Jon Lewis (Aug 11)
- Re: "Tactical" /24 announcements Tom Hill (Aug 12)
- Re: "Tactical" /24 announcements William Herrin (Aug 12)
- Re: "Tactical" /24 announcements Hank Nussbacher (Aug 12)
- Re: "Tactical" /24 announcements Amir Herzberg (Aug 12)
- Re: "Tactical" /24 announcements Mark Tinka (Aug 13)
- Re: "Tactical" /24 announcements William Herrin (Aug 12)
- Re: "Tactical" /24 announcements William Herrin (Aug 12)
- Re: "Tactical" /24 announcements Amir Herzberg (Aug 12)
- Re: "Tactical" /24 announcements William Herrin (Aug 12)
- Re: "Tactical" /24 announcements Baldur Norddahl (Aug 12)