Fa0/5 – show ip route X.X.X.X – * karakter


Mit jelent a * karakter az alábbi kimenetben?

M2515-B# show ip route 1.0.0.0
Routing entry for 1.0.0.0/8
  Known via "rip", distance 120, metric 1
  Redistributing via rip
  Advertised by rip (self originated)
  Last update from 192.168.75.7 on Serial1, 00:00:00 ago
  Routing Descriptor Blocks:
  * 192.168.57.7, from 192.168.57.7, 00:00:18 ago, via Serial0
      Route metric is 1, traffic share count is 1
    192.168.75.7, from 192.168.75.7, 00:00:00 ago, via Serial1
      Route metric is 1, traffic share count is 1

Ha ráfrissítesz a parancsra akkor a * karakter ugrál a két route között.

A jelentése pedig: equal-cost route esetén merre megy a következő csomag/flow. Ez a kimenet CEF-nél már nem igazán játszik, de a régi process/fast switched időkben volt jelentősége.

You can usually use the show ip route command to find equal cost routes. For example, below is the show ip route command output to a particular subnet that has multiple routes. Notice there are two routing descriptor blocks. Each block is one route. There is also an asterisk (*) next to one of the block entries. This corresponds to the active route that is used for new traffic. The term ‘new traffic’ corresponds to a single packet or an entire flow to a destination, depending on the type of switching configured.

  • For process-switching—load balancing is on a per-packet basis and the asterisk (*) points to the interface over which the next packet is sent.
  • For fast-switching—load balancing is on a per-destination basis and the asterisk (*) points to the interface over which the next destination-based flow is sent.

The position of the asterisk (*) keeps rotating among the equal cost paths each time a packet/flow is served.

 

(forrás)

Leave a Reply

This site uses Akismet to reduce spam. Learn how your comment data is processed.