Wednesday, May 30, 2007

Something about PBB-TE (PBT) & T-MPLS

最近PBT(已经被IEEE改名为PBB-TE)和T-MPLS炒的比较热,下图是Meriton提供的两种技术对比,总而言之两种技术都还有一些问题需要解决,都处在艰难的standardization过程中,因此Juniper,Cisco,Alcatel-Lucent目前都相对保持观望和中立。在电信网络日新月异的今天,最新的东西未必就那么吸引人,一方面SP们通常没有足够的motivation去对现有网络做大规模的改造,更不会在新建网络中做大规模的部署,另一方面这些技术或许还没熬过测试,完善和认可阶段就被更新的技术取代了,正所谓“还未开始,就已结束”。

Anyway,在BT可能有机会接触这两种技术,而且BT更倾向于PBT,但可能是因为多数人都比较反感改变和新事物,再加上Nortel的marketing做得实在有些让人恶心,感觉下来还是对T-MPLS比较有好感。

另外无意中看到Juniper的大牛Yakov在IETF的mail group中PK Nortel的PBT技术负责人Allen和Fedyk,还是比较有火药味的。

(click the picture to zoom in)

Some useful documents from IETF:
http://tools.ietf.org/id/draft-fedyk-gmpls-ethernet-pbt-01.txt
http://www.ietf.org/internet-drafts/draft-allan-pw-o-pbt-02.txt
http://www.ietf.org/internet-drafts/draft-ietf-pwe3-mpls-transport-00.txt

G.8110.1 (https://datatracker.ietf.org/documents/LIAISON/file288.zip) G.8112 (https://datatracker.ietf.org/documents/LIAISON/file289.zip) G.8121 (https://datatracker.ietf.org/documents/LIAISON/file290.zip)

Friday, May 25, 2007

Cisco routers caused major outage in Japan

看来NTT测试和设计很不到位阿,哈哈。
Cisco routers caused major outage in Japan
Between 2,000 and 4,000 Cisco routers went down for about 7 hours in the NTTEast network after a switchover to backup routes triggered the routers to rewrite routing tables, according to a bulletin from CIBC World Markets. Theoutage disconnected millions of broadband Internet users across most of eastern Japan.The routing table rewrite overflowed the routing tables and caused the router's forwarding process to fail, the CIBC report states.
Millions disconnected by ntt broadband outage

Wednesday, May 23, 2007

Monday, May 21, 2007

GOOOOOOOOOOOOOOOOOOOL!!!!!

在联赛最终的冲刺阶段,第n场逆转取胜,创纪录的赛季第十一场客场胜利,连续第二场终场前绝杀,真是太有才了!除了冠军还有什么配得上这样的球队!

Ale,ale, ale Real Madrid ale ...!!! Lider otra semanita más !!!