nanog mailing list archives
Re: Arista Routing Solutions
From: Patrick Cole <z () amused net>
Date: Thu, 28 Apr 2016 23:13:13 +1000
Laszln, Thu, Apr 28, 2016 at 12:47:45PM +0000, Laszlo Hanyecz wrote:
On 2016-04-28 11:06, Alain Hebert wrote:Well, Once you eliminate the ~160k superfluous prefixes (last time I checked)... This is a none issue. Some work on some sort summary function would keep those devices alive... but we all know there is more money to be made the faster the device become obsolete :(Can you explain how this works? How can a router determine which prefix is superfluous? How does it cope when a suppressed prefix is withdrawn or a more specific prefix is added? Is this just one of those 'it works some of the time' solutions or is this something that can be done safely with an appropriate algorithm?
A fair chunk of the routing table is aggregable. If multiple aggregable prefixes share the same nexthop, the HW entries can be summarised accordingly, reducing the HW resource footprint. Should one of the smaller prefixes be withdrawn or best path change to another nexthop, the control plane needs to be smart enough to adapt and reprogram the HW accordingly. It is a fairly logical and reasonable algorithm to construct -- Patrick Cole <z () wwwires com> Senior Network Specialist World Without Wires PO Box 869. Palm Beach, QLD, 4221 Ph: 0410 626 630
Current thread:
- Re: Arista Routing Solutions, (continued)
- Re: Arista Routing Solutions Ryan Woolley (Apr 26)
- Re: Arista Routing Solutions Paras Jha (Apr 26)
- RE: Arista Routing Solutions Timothy Creswick (Apr 28)
- Message not available
- Re: Arista Routing Solutions Ryan Woolley (Apr 24)
- Re: Arista Routing Solutions Colton Conor (Apr 25)
- Re: Arista Routing Solutions Ryan Woolley (Apr 26)
- RE: Arista Routing Solutions Peter Kranz (Apr 27)
- Re: Arista Routing Solutions lincoln dale (Apr 27)
- Re: Arista Routing Solutions Alain Hebert (Apr 28)
- Re: Arista Routing Solutions Laszlo Hanyecz (Apr 28)
- Re: Arista Routing Solutions Patrick Cole (Apr 28)
- Re: Arista Routing Solutions Ryan Woolley (Apr 28)