ppp's two subnets...

at first i thought i was losing my mind, that i had some type of misconfiguration with ppp...  but i didn't...  ppp will display 2 subnets for each directly connected route; one with the mask that was designed and also a slash 32... this is the behavior of ppp...


no routing protocols, no static or default routes, and with hdlc we have:

r2620_01#sh ip route
Codes:
Gateway of last resort is not set

     1.0.0.0/24 is subnetted, 1 subnets
C       1.1.1.0 is directly connected, Loopback0
     10.0.0.0/30 is subnetted, 2 subnets
C       10.0.30.0 is directly connected, Serial0/1
C       10.0.20.0 is directly connected, Serial0/0
C    192.168.1.0/24 is directly connected, FastEthernet0/0
r2620_01#

and likewise for the routers...

r2620_02#sh ip route
Codes:
Gateway of last resort is not set

     2.0.0.0/24 is subnetted, 1 subnets
C       2.2.2.0 is directly connected, Loopback0
     10.0.0.0/30 is subnetted, 1 subnets
C       10.0.20.0 is directly connected, Serial0/0
C    192.168.1.0/24 is directly connected, FastEthernet0/0

but when you flip to ppp...

r2620_01(config-if)#do sh ip route
Codes: Gateway of last resort is not set

     1.0.0.0/24 is subnetted, 1 subnets
C       1.1.1.0 is directly connected, Loopback0
     10.0.0.0/8 is variably subnetted, 4 subnets, 2 masks
C       10.0.30.0/30 is directly connected, Serial0/1
C       10.0.30.2/32 is directly connected, Serial0/1
C       10.0.20.2/32 is directly connected, Serial0/0
C       10.0.20.0/30 is directly connected, Serial0/0
C    192.168.1.0/24 is directly connected, FastEthernet0/0
r2620_01(config-if)#

r2620_03#sh ip route
Codes:
Gateway of last resort is not set

     3.0.0.0/24 is subnetted, 1 subnets
C       3.3.3.0 is directly connected, Loopback0
     172.16.0.0/30 is subnetted, 1 subnets
C       172.16.0.0 is directly connected, FastEthernet0/0
     10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C       10.0.30.0/30 is directly connected, Serial0/0
C       10.0.30.1/32 is directly connected, Serial0/0
r2620_03#

ppp is the gift that keeps on giving...

eigorp...

EIGRP

live it, love it...

eigrp is a cisco proprietary hybrid routing protocol. it uses an autonomous sytem to
describe the set of contiguous routers that use the same protocol and routing information.

it includes the subnet mask in its updates (vlsm capable)
eigrp has both distance vector and link state qualities. it sends distance vector network
information and the costs associated with reaching those networks from the vantage point of the
advertising router.

its link state characteristics include sync'ing routing tables between neighbors at startup and
sending updates when the topology changes

eigrp uses rtp (reliable transport protocol)
has efficient neighbor discovery
uses dual (diffusing update algorithm) for best path selection
supports vlsm

it also uses protocol dependant modules which is a way of saying it can support multiple
protocols such as appletalk and ipx, much like is-is can support ip and clns... but who in their
right mind uses appletalk and ipx anymore...

grrrrrrrrrrrrp...

quiz...

1) what is the root bridge default priority?

2) what is the DOD equivalent of the OSI transport layer?

3) what is 90.37.200.31 in binary?

4)  /17.  how many subnets and hosts?

5)  what is the hop count for OSPF?

6) what kind of traffic does IGMP service?

7) IP is connection oriented? true or false

8) what is 2 to the 15th?

9) what does CHAP stand for?

10) how do you turn off CDP on an interface?

bonus:  what is the theme of this quiz?

answers after the trip