BGP zombies and excessive path hunting (opens in new tab)

(blog.cloudflare.com)

49 pointsemot4mo ago9 comments

9 comments

I thought the bigger /32 prefix should be advertised from AS64511 to both AS13335 and AS64510.

Is there free BGP peering for the purpose of only passing on the NLRIs?

It's interesting that on the "open positions" page, the location filter appears to be strictly string matching, e.g. "US" does not cover "New York, US"

toast04mo ago

I don't think it makes sense for AS64511 (example customer) to advertise the /32 to AS13335 (Cloudflare) when they only want the /48 to be routed through Cloudflare.

pm22224mo ago

/32 is not gonna matter when /48 is present. When /48 is not present, why wouldn’t /32 be advertised?

1 more reply

pm22224mo ago

Interesting that this comment was added 9 days ago all of a sudden it pops up now with a 3hour stamp.

metadat4mo ago

This happens when a story is revitalized through the second chance pool.

https://news.ycombinator.com/item?id=26998308

https://news.ycombinator.com/pool

amenghra4mo ago

A zombie comment? How appropriate…

great_wubwub4mo ago

> Things get more interesting when AS64510 signals for 2001:db8::/48 to be withdrawn by Cloudflare (AS13335)

Typo - shouldn't that be AS64511?

...and...

> The MRAI specifies the minimum amount of time ... between each BGP advertisement update.

Each update _per prefix, per peer_. RFC4271 sec.9.2.1.1 says

--- [MRAI] determines the minimum amount of time that must elapse between an advertisement and/or withdrawal of routes to a particular destination by a BGP speaker to a peer ---

j / k navigate · click thread line to collapse

9 comments

pm22224mo ago

I thought the bigger /32 prefix should be advertised from AS64511 to both AS13335 and AS64510.

Is there free BGP peering for the purpose of only passing on the NLRIs?

It's interesting that on the "open positions" page, the location filter appears to be strictly string matching, e.g. "US" does not cover "New York, US"

toast04mo ago

I don't think it makes sense for AS64511 (example customer) to advertise the /32 to AS13335 (Cloudflare) when they only want the /48 to be routed through Cloudflare.

pm22224mo ago

/32 is not gonna matter when /48 is present. When /48 is not present, why wouldn’t /32 be advertised?

1 more reply

pm22224mo ago

Interesting that this comment was added 9 days ago all of a sudden it pops up now with a 3hour stamp.

metadat4mo ago

This happens when a story is revitalized through the second chance pool.

https://news.ycombinator.com/item?id=26998308

https://news.ycombinator.com/pool

amenghra4mo ago

A zombie comment? How appropriate…

great_wubwub4mo ago

> Things get more interesting when AS64510 signals for 2001:db8::/48 to be withdrawn by Cloudflare (AS13335)

Typo - shouldn't that be AS64511?

...and...

> The MRAI specifies the minimum amount of time ... between each BGP advertisement update.

Each update _per prefix, per peer_. RFC4271 sec.9.2.1.1 says

--- [MRAI] determines the minimum amount of time that must elapse between an advertisement and/or withdrawal of routes to a particular destination by a BGP speaker to a peer ---

j / k navigate · click thread line to collapse