From: C Chan (cch.ccie@gmail.com)
Date: Mon May 12 2008 - 06:32:15 ART
Hi expert,
Regarding to IEWB lab 12 task 6.2, there are a lot of discussions about how
to config and where to apply helper-map and directed broadcast. The SG does
provide a workable solution and testing suggestion for us. But, did anybody
spot that the testing packet generated by SW1 IP SLA must be "control
disable"? It seems that the IP SLA generated packet cannot be set to
"control enable" in which the packet cannot be picked by R3 to do multicast
to broadcast conversion.
I tried to find the answer from docCD. But, I cannot see the relationship
between between helper-map conversion and control packet.
Could anybody can explain?
Regards,
CH
Quote from DocCD
"Use the optional control keyword to specify that the IP SLAs control
protocol should be used when running this operation. The control protocol is
required when the target device is a Cisco router that does not natively
provide the UDP service. Use the disable keyword when you want to disable
the control protocol. The control protocol is enabled by default."
*SW1 IP SLA control disable*
SW1#s rtr conf | i Control|address
Target address: 225.25.25.25
Source address: 129.1.17.7
Control Packets: disabled
R3#a 123
Extended IP access list 123
10 permit udp any any eq 31337 (2 matches)
R2#a 123
Extended IP access list 123
10 permit udp any any eq 31337 (3 matches)
*SW1 IP SLA control enable*
SW1#s rtr conf | i Control|address
Target address: 225.25.25.25
Source address: 129.1.17.7
Control Packets: enabled
R3#a 123
Extended IP access list 123
10 permit udp any any eq 31337
R2#a 123
Extended IP access list 123
10 permit udp any any eq 31337
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