nanog mailing list archives
Re: Are SW upgrades needed in MPLS core networks?
From: Petri Helenius <pete () he iki fi>
Date: Fri, 06 Feb 2004 20:55:00 +0200
Rubens Kuhl Jr. wrote:
There is another factor at play here which is memory bandwidth at the lookup engine. If you have to look deeper into the packet than you can accomplish by using single spin trough the thing that fetches x bit wide words from the packet, you´ll effectively half your packet rate.I don't get why Juniper and Cisco trie-lookup forwarding would differ in comparing IPv4 and IPv6; Juniper does a 8+1+1+1+1+... search until a leaf node is found, while Cisco does 16+8+8 (or something near it but still with 3 phases); for both architetures, IPv6 longer addresses implies walking more deeply into the tree in order to find where to route.
Doing 8+1+1+1+1+... would seem wasteful for IPv6 with the current address allocation scheme, are you sure that´s what´s used for IPv6 too?
Pete
Current thread:
- Re: Are SW upgrades needed in MPLS core networks? Pekka Savola (Feb 06)
- Re: Are SW upgrades needed in MPLS core networks? Rubens Kuhl Jr. (Feb 06)
- Re: Are SW upgrades needed in MPLS core networks? Randy Bush (Feb 06)
- Re: Are SW upgrades needed in MPLS core networks? Rubens Kuhl Jr. (Feb 06)
- Re: Are SW upgrades needed in MPLS core networks? Richard A Steenbergen (Feb 06)
- Re: Are SW upgrades needed in MPLS core networks? Rubens Kuhl Jr. (Feb 06)
- Re: Are SW upgrades needed in MPLS core networks? Randy Bush (Feb 06)
- Re: Are SW upgrades needed in MPLS core networks? Andy Dills (Feb 06)
- Message not available
- Re: Are SW upgrades needed in MPLS core networks? Rubens Kuhl Jr. (Feb 06)
- Re: Are SW upgrades needed in MPLS core networks? Randy Bush (Feb 06)
- Re: Are SW upgrades needed in MPLS core networks? Petri Helenius (Feb 06)
- Re: Are SW upgrades needed in MPLS core networks? Rubens Kuhl Jr. (Feb 06)
- Re: Are SW upgrades needed in MPLS core networks? Petri Helenius (Feb 06)
- Re: Are SW upgrades needed in MPLS core networks? Richard A Steenbergen (Feb 06)
- Re: Are SW upgrades needed in MPLS core networks? Rubens Kuhl Jr. (Feb 06)
- Re: Are SW upgrades needed in MPLS core networks? Richard A Steenbergen (Feb 06)
- Re: Are SW upgrades needed in MPLS core networks? Rubens Kuhl Jr. (Feb 06)
- <Possible follow-ups>
- Re: Are SW upgrades needed in MPLS core networks? Michael . Dillon (Feb 09)