From: David Lonnie (david.lonnie@gmail.com)
Date: Wed Jun 04 2008 - 00:05:14 ART
Hi,all:
I'm reading a book named "CCIE developing ip multicast networks" that Cisco
pressed.
I'm confusing here.
You need to convert broadcast to multicast on Router A, and then convert
multicast to broadcast on Router B.
-------- (e0/0)A(s0/0)--------------(s0/0)B(e0/0)--------
This is the context I quote.
Example 16-23: Router A Configuration
Interface Ethernet0
ip address 10.1.1.10 255.255.255.0
ip directed-broadcasts
ip multicast helper-map broadcast 224.1.1.1 100 ttl 15
access-list 100 permit any any udp 2000
access-list 100 deny any any udp
ip forward-protocol udp 2000
In addition to the ip multicast helper-map command, the ip
directed-broadcasts command was added
to the Ethernet0. This command is necessary to enable the router to process
the incoming broadcast
packets on Ethernet0. If this command were not added, the router would
simply ignore all incoming
broadcast packets on this interface and they would not get translated to
multicast. Even with this
command added, the router will process only those broadcast packets with
certain standard UDP port
numbers (TFTP, BOOTP, DNS, NetBIOS Name Server, NetBIOS Datagram Server, and
TACACS) by
default. Therefore, it is also necessary to add the ip forward-protocol udp
2000 command to instruct
the router to also process the incoming broadcast packets with a UDP
destination port of 2000.
But when i read Doc CD.
http://www.cisco.com/en/US/docs/ios/ipmulti/configuration/guide/imc_inter_mc_helper_ps6350_TSD_Products_Configuration_Guide_Chapter.html#wp1056657
there is no "ip directed-broadcasts" command.
My question is that what does this command really mean.Can anybody help me
to make a choice when in the lab?
Thanks in advance.
David
This archive was generated by hypermail 2.1.4 : Tue Jul 01 2008 - 06:23:20 ART