1. RIP V2
CCNP S1(5), Chapter 4

2. Distance Vector Protocols
Use split horizon, poison reverse, holddown, triggered updates, and route aging to prevent routing loops
Use Bellman Ford algorithm (hop count) for best path – defined in RFC 1058
Can use load balancing to distribute traffice evenly among paths

3. RIPv2 Facts Distance Vector Protocol
Classless – carries subnet mask in routing update
Uses UDP port 520
Maximum hop count is 15
Hop count determines best path
Maximum routes in routing update is 25
When route fails, an alternate route is determined from subsequent scheduled routing updates
Optimal path is based on a configurable fixed cost metric

4. RIPV2 Continued An enhanced version of RipV1
Multicast updates sent on

5. RIPv1 and v2 Convergence
When route fails, a flash update is sent and route entry is removed from table
Called a triggered update with poison reverse
Receiving router sends flash updates and puts affected route in holddown
Originating router queries neighbor for alternative routes
Originating router installs best alternative route it hears
Routers in holddown ignore alternative route

6. RIPv2 Commands IP RIP send FA0/0 Debug IP RIP
Will implement interface-level RIP compatability switches
Debug IP RIP
Will enable RIP routing transactions debugging
IP RIP Authentication mode md5
Allows updates from neighbors
No auto-summary
Permits you to advertise discontiguous networks

7. RIPv2 Miscellaneous Passwords sent in clear text
Can use passive interface command from router (config-router)# prompt to block interface from forwarding updates

8. RIP V1 and V2
Version 2 command RIP V2 will send and receive only V2 updates
Default behavior for RIP is to send only V1 but listen for both V1 and V2
V2 adds route tag and subnet mask fields

9. Administrative Distance
Connected Interface 0
Static Route 1
EIGRP Summary 5
BGP 20
EIGRP 90
IGRP
OSPF
RIP