[合集] 为什么L2SC用MST而router用SPF - 未名空间MITBBS历史存档

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[合集] 为什么L2SC用MST而router用SPF

[合集] 为什么L2SC用MST而router用SPF# EmergingNetworking - 热门网络技术

z*r2007-10-30 07:10

1 楼

☆─────────────────────────────────────☆
camping (Nature) 于 (Sat Oct 27 22:10:58 2007) 提到:
突然想到这个问题：
Ethernet switch用Minimum spanning tree 算法来确定如何forward frame,
而IP router用shorted path first, 为什么ethernet switch 不也用spf呢？
☆─────────────────────────────────────☆
bluenose (OC3072) 于 (Sun Oct 28 01:52:10 2007) 提到:
This is a good question, the answer is that there is a basic difference between MAC address and IP address, MAC address does not have built-in hierarchy, i.e, it can not be summari

z*r2007-10-30 07:10

2 楼

那天突然看到一个802.1aq，就是shortest path bridging

between MAC address and IP address, MAC address does not have built-in
hierarchy, i.e, it can not be summarized, in a flat network, spanning tree
is the only solution. As Etherne
spanning tree is no-longer sufficient for large L2 networks, because of
inefficiency of spanning tree protocol.
dynamic L2 routing protocol running, Ethernet frames will be routed somewhat
like how ISIS is working for CLNS network.

【在 z**r 的大作中提到】

: ☆─────────────────────────────────────☆
: camping (Nature) 于 (Sat Oct 27 22:10:58 2007) 提到:
: 突然想到这个问题：
: Ethernet switch用Minimum spanning tree 算法来确定如何forward frame,
: 而IP router用shorted path first, 为什么ethernet switch 不也用spf呢？
: ☆─────────────────────────────────────☆
: bluenose (OC3072) 于 (Sun Oct 28 01:52:10 2007) 提到:
: This is a good question, the answer is that there is a basic difference between MAC address and IP address, MAC address does not have built-in hierarchy, i.e, it can not be summari