关于EIGRP show ip protocol当中出现的maximum hop代表什么意思？

ccnafasttrack

  Default networks accepted from incoming updates
  EIGRP-IPv4 Protocol for AS(90)
    Metric weight K1=1, K2=0, K3=1, K4=0, K5=0
    NSF-aware route hold timer is 240
    Router-ID: 192.168.1.1
    Topology : 0 (base)
      Active Timer: 3 min
      Distance: internal 90 external 170
      Maximum path: 4
      Maximum hopcount 100
      Maximum metric variance 1

  Automatic Summarization: disabled
  Maximum path: 4
  Routing for Networks:
    0.0.0.0
  Routing Information Sources:
    Gateway         Distance      Last Update
    192.168.1.2           90      00:00:05
  Distance: internal 90 external 170
默认这个值是100，难道意思是说EIGRP最多支持100跳吗（在同一个AS）但是我查了一些资料，资料上说最多支持255台路由器啊，这是怎么回事？

sboku

Cisco的解释：
metric maximum-hops

Command Default：The maximum number of hops is 100

This command provides a safety mechanism that breaks any potential count-to-infinity problems. It causes the IP routing software to advertise as unreachable routes with a hop count greater than the value assigned to the hops-number argument.

Rockyw

这个应该是默认的管理距离吧，刚好是100