Lessons learned:
RIP Update:
The updates themselves depend on what version of RIP is
running.
Broadcast
-RIPv1 default
-RIPv2 optional with # ip rip v2-broadcast
Multicast
-RIPv2 default – uses address 224.0.0.9
Unicast
-RIPv1 / RIPv2 optional
-neighbor (address) – enable unicast update (this does not suppress
the multicast of broadcast updates)
This means if I want to send updates only to a neighbor, I
will have to setup the neighbor statement on both neighbor routers and then
configure the passive interface commands.
-passive-interface (interface) – suppress normal broadcast /
multicast updates
You can verify the updates with the cmd –
Debug ip rip
Debug ip packet
Debug ip packet detail
RIP Broadcasts:
R3#sh ip interface fastEthernet 0/0
FastEthernet0/0 is up, line protocol is up
Internet address is 192.168.23.3/24 – this is
the directed broadcast the actuall address will look like 192.168.23.255
Broadcast address is 255.255.255.255
- this is the broadcast address
Address determined
by non-volatile memory
MTU is 1500 bytes
Helper address is
not set
Directed broadcast forwarding is disabled - this is normally disabled, due to security vulnerabilities
Multicast reserved
groups joined: 224.0.0.9
Outgoing access list
is not set
Inbound access list is not set
Proxy ARP is enabled
Local Proxy ARP is
disabled
Security level is
default
Split horizon is
enabled
ICMP redirects are
always sent
ICMP unreachables
are always sent
ICMP mask replies
are never sent
IP fast switching is
enabled
IP fast switching on
the same interface is disabled
IP Flow switching is
disabled
IP CEF switching is
enabled
IP CEF Fast
switching turbo vector
IP multicast fast
switching is enabled
IP multicast
distributed fast switching is disabled
IP route-cache flags
are Fast, CEF
Router Discovery is
disabled
IP output packet
accounting is disabled
IP access violation
accounting is disabled
TCP/IP header
compression is disabled
RTP/IP header
compression is disabled
Policy routing is
disabled
Network address
translation is disabled
BGP Policy Mapping
is disabled
WCCP Redirect
outbound is disabled
WCCP Redirect
inbound is disabled
WCCP Redirect
exclude is disabled
R3#
Directed broadcast
forwarding is disabled - normally
you’d not want to do this, is this is on it means that devices can now deliver
broadcasts onto this subnet.
Logs for v1 and v2 updates:
I enabled rip updated for both v1 and v2 on the interface
between two routers talking RIP.
interface FastEthernet0/0
ip address
192.168.23.3 255.255.255.0
ip rip send version 1 2
ip rip receive version 1 2
*Mar 1 00:39:53.779: RIP: sending v1 update to
255.255.255.255 via FastEthernet0/0 (192.168.23.3) RIP v1 updates via the 255 broadcast address off FA0/0
*Mar 1 00:39:53.783:
RIP: build update entries
*Mar 1
00:39:53.783: network 10.0.0.0 metric 1
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