PPP neighbour route & EIGRP

From: Sergey (public@svlp.net)
Date: Sun Aug 19 2007 - 07:41:38 ART


R3---R1---R2

Link between R3 & R1 is PPP, between R1 & R2 FR
EIGRP is routing protocol

R1 config

interface Serial1/1
 description Link to R3
 ip address 164.1.13.1 255.255.255.0
 encapsulation ppp

interface Serial1/0
 description Link to R2
 ip address 164.1.12.1 255.255.255.0
 encapsulation frame-relay

router eigrp 10
 network 164.1.12.1 0.0.0.0
 network 164.1.13.1 0.0.0.0

Rack1R1#sh ip ro 164.1.13.3
Routing entry for 164.1.13.3/32
  Known via "connected", distance 0, metric 0 (connected, via interface)
  Redistributing via eigrp 10
  Advertised by eigrp 10
  Routing Descriptor Blocks:
  * directly connected, via Serial1/1
      Route metric is 0, traffic share count is 1

Ok it is normal, it is ppp peer neighbor-route,
but why eigrp process advertise it in eigrp domain?? Other routing protocols don't do it.

Rack1R2#sh ip ro 164.1.13.3
Routing entry for 164.1.13.3/32
  Known via "eigrp 10", distance 90, metric 11023872, type internal
  Redistributing via eigrp 10
  Last update from 164.1.12.1 on Serial1/0.12, 00:14:30 ago
  Routing Descriptor Blocks:
  * 164.1.12.1, from 164.1.12.1, 00:14:30 ago, via Serial1/0.12

PS: Explain please what do keywords "Known via", "Redistributing via" and "Advertised by" mean?

Rack1R3#sh ip ro 164.1.12.0
Routing entry for 164.1.12.0/24
  Known via "eigrp 10", distance 90, metric 18063872, type internal
  Redistributing via eigrp 10, ospf 10
  Advertised by ospf 10 subnets
  Last update from 164.1.13.1 on Serial1/2, 00:08:38 ago



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