nanog mailing list archives
Re: Anycast 101
From: William Allen Simpson <wsimpson () greendragon com>
Date: Fri, 17 Dec 2004 09:27:25 -0500
Iljitsch van Beijnum wrote:
On 17-dec-04, at 3:06, Steve Gibbard wrote:under some very specific circumstances it can also happen with per packet load balancing.You're misunderstanding how per-packet load balancing is generally used.I wasn't saying anything about how per packet load balancing is generaly used, the point is that it's possible that subsequent packets end up at different anycast instances when a number of specific prerequesites exists. In short: a customer must pplb across two routers at the same ISP, and each of those routers must have different preferred paths to different anycast instances. This isn't going to happen often, but it's not impossible, and it's not bad engineering on the customer's or ISP's part if it does, IMO.
You're wrong. That's VERY bad engineering!PPLB requires 2 routers, one at each end of the link bundle.
More than 1 router at any end will lead to a lot more problems than anycast, including multicast and any stateful protocol (like TCP). For one thing, the load balancing will be only in 1 direction, and will lead to congestion in the reverse path.... Self defeating. -- William Allen Simpson Key fingerprint = 17 40 5E 67 15 6F 31 26 DD 0D B9 9B 6A 15 2C 32
Current thread:
- Re: Anycast 101, (continued)
- Re: Anycast 101 Crist Clark (Dec 16)
- Re: Anycast 101 Valdis . Kletnieks (Dec 17)
- Re: Anycast 101 Douglas K. Fischer (Dec 23)
- Re: Anycast 101 Suzanne Woolf (Dec 16)
- Re: Anycast 101 Alon Tirosh (Dec 16)
- Re: Anycast 101 Stephane Bortzmeyer (Dec 17)
- Re: Anycast 101 Iljitsch van Beijnum (Dec 17)
- Re: Anycast 101 Michael . Dillon (Dec 17)
- Re: Anycast 101 Marshall Eubanks (Dec 17)
- Re: Anycast 101 William Allen Simpson (Dec 17)
- Re: Anycast 101 Iljitsch van Beijnum (Dec 17)
- Re: Anycast 101 William Allen Simpson (Dec 17)
- Re: Anycast 101 Steve Gibbard (Dec 17)
- Re: Anycast 101 Iljitsch van Beijnum (Dec 17)
- Re: Anycast 101 Joe Abley (Dec 17)
- Re: Anycast 101 Joe Shen (Dec 20)
- Re: Anycast 101 Iljitsch van Beijnum (Dec 17)
- Re: Anycast 101 William Allen Simpson (Dec 17)