Question about IP Route results for bgp, specifically "Routing Descriptor Blocks:"

I know what some of this means, such as the route is using bgp 6500 and the distance of 200, but I'm not sure about the
Routing Descriptor Blocks: information and what it means.

Example:
#sh ip route 142.23.52.0 255.255.255.192
Routing entry for 142.23.52.0/26
  Known via "bgp 65000", distance 200, metric 0, type internal
  Last update from 142.23.55.180 4w1d ago
  Routing Descriptor Blocks:
  * 142.23.55.180, from 142.23.55.170, 6w1d ago
      Route metric is 0, traffic share count is 1
dsterlingAsked:
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TimotiStDatacenter TechnicianCommented:
Routing descriptor blocks describe the route, and they depend on the source/protocol the route was learned.
In your case, the route was learned from 142.23.55.170 over 6weeks ago. The metric is 0, and the traffic shares 1 route(s), so there's not equal-cost-multipathing in this case.

An example from EIGRP would be:
sh ip ro 4.4.4.4
Routing entry for 4.4.4.4/32
  Known via "eigrp 10", distance 90, metric 768, type internal
  Redistributing via eigrp 10
  Last update from 10.23.23.3 on FastEthernet0/1, 00:08:39 ago
  Routing Descriptor Blocks:
    10.23.23.3, from 10.23.23.3, 00:08:39 ago, via FastEthernet0/1
      Route metric is 768, traffic share count is 1
      Total delay is 30 microseconds, minimum bandwidth is 10000 Kbit
      Reliability 255/255, minimum MTU 1500 bytes
      Loading 1/255, Hops 2
  * 10.12.12.1, from 10.12.12.1, 00:08:39 ago, via FastEthernet0/0
      Route metric is 768, traffic share count is 1
      Total delay is 30 microseconds, minimum bandwidth is 10000 Kbit
      Reliability 255/255, minimum MTU 1500 bytes
      Loading 1/255, Hops 2

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containing EIGRP-specific descriptions.

Tamas
0
dsterlingAuthor Commented:
Tamas, thanks for the explanation, I understand what you are saying, but if the route was learned from 142.23.55.170 over 6weeks ago (* 142.23.55.180, from 142.23.55.170, 6w1d ago) then what does the "Last update from 142.23.55.180 4w1d ago" mean in the:

Routing entry for 142.23.52.0/26
  Known via "bgp 65000", distance 200, metric 0, type internal
  Last update from 142.23.55.180 4w1d ago

Dave
0
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