Cisco IOS 设备上的 RIP 简要比较

RIP Implementations

Original RIP implementation, limited to classful routing(obsolete)

Introduced support for classless routing, authentication,triggered updates, and multicast announcements (RFC 2453)

Extends RIPv2 to support IPv6 routing (RFC 2080); functions very similarly to RIPv2 and is subsequently as limited

RIP version	RIPv1	RIPv2	RIPng
IP version	IPv4	IPv4	IPv6
Admin Distance	120	120	120
UDP Port	520	520	521
Classless	No	Yes	Yes
Adv. Address	Broadcast	224.0.0.9	FF02::9
Authentication	None	Plain, MD5	None

! Enable RIPv2 IPv4 routing

router rip

version 2

! Disable RIPv2 automatic summarization

no auto-summary

! Designate RIPv2 interfaces by network

network network

! Identify unicast-only neighbors

neighbor IP-address

! Originate a default route

default-information originate

! Designate passive interfaces

passive-interface {interface | default}

! Modify timers

timers basic update invalid hold flush

! Configure manual route summarization

ip summary-address rip network mask

! Enable MD5 authentication (RIPv2 only)

ip rip authentication mode md5

ip rip authentication key-chain key-chain

! Enable IPv6 routing

ipv6 unicast-routing

! Enable RIPng IPv6 routing

ipv6 router rip name

! Toggle split-horizon and poison-reverse

no\] poison-reverse \[no\] split-horizon ! Modify timers timers basic update invalid hold flush ## RIPng Interface Configuration ! Enable RIPng on the interface ipv6 rip name enable ! Configure manual route summarization ipv6 rip name summary-address prefix ## Attributes | Type | Distance Vector | |:---------------|:-------------------| | Algorithm | Bellman-Ford | | Admin Distance | 120 | | Metric | Hop count (max 15) | | Standard | RFCs 2080, 2453 | | Protocols | IPv4, IPv6 | | Transport | UDP | | Authentication | Plaintext, MD5 | | Multicast IP | 224.0.0.9/FF02::9 | ## Timer Defaults | Update | 30 sec | |:----------|:--------| | Flush | 240 sec | | Invalid | 180 sec | | Hold-down | 180 sec | ## Troubleshooting show ip\[v6\] protocols show ip\[v6\] rip database show ip\[v6\] route rip debug ip rip { database \| events } debug ipv6 rip \[interface

A rule that states a router may not advertise a route back to the neighbor from which it was learned

When a network becomes unreachable, an update with an infinite metric is generated to explicitly advertise the route as unreachable

A router advertises a network as unreachable through the interface on which it was learned