02-18-2009 04:42 PM - edited 03-06-2019 04:07 AM
When more than one ip helper-address is configured on an interface, does the switch send out a unicast request to all IP helper addresses at the same time, or is there a round-robin or other sort of preferential treatment?
Thanks in advance -w
02-18-2009 05:18 PM
The answer is:
switch send out a unicast request to all IP helper addresses at the same time
HTH,
__
Edison.
02-19-2009 11:15 AM
Thanks!
02-19-2009 02:36 PM
It cannot be at the same time.
First is the first, last is the last.
Some times it makes sense.
02-19-2009 03:02 PM
R3 (F0/1) <--LAN--> (F0/1) R1
R3:
interface FastEthernet0/1
description R1
ip address 192.168.13.3 255.255.255.0
ip helper-address 192.168.34.4
ip helper-address 192.168.34.5
R1:
interface FastEthernet0/1
description R3
ip address dhcp
shutdown
duplex auto
speed auto
no clns route-cache
R1(config-if)#int f0/1
R1(config-if)#no shut
R3#
00:05:22: DHCPD: setting giaddr to 192.168.13.3.
00:05:22: DHCPD: BOOTREQUEST from 0063.6973.636f.2d63.6130.302e.3166.6338.2e30.3030.362d.4661.302f.31 forwarded to 192.168.34.4.
00:05:22: DHCPD: BOOTREQUEST from 0063.6973.636f.2d63.6130.302e.3166.6338.2e30.3030.362d.4661.302f.31 forwarded to 192.168.34.5.
00:05:23: IP-EIGRP(Default-IP-Routing-Table:1): Neighbor 0.0.0.0 not on common subnet for FastEthernet0/1
00:05:25: DHCPD: setting giaddr to 192.168.13.3.
00:05:25: DHCPD: BOOTREQUEST from 0063.6973.636f.2d63.6130.302e.3166.6338.2e30.3030.362d.4661.302f.31 forwarded to 192.168.34.4.
00:05:25: DHCPD: BOOTREQUEST from 0063.6973.636f.2d63.6130.302e.3166.6338.2e30.3030.362d.4661.302f.31 forwarded to 192.168.34.5.
00:05:27: DHCPD: setting giaddr to 192.168.13.3.
00:05:27: DHCPD: BOOTREQUEST from 0063.6973.636f.2d63.6130.302e.3166.6338.2e30.3030.362d.4661.302f.31 forwarded to 192.168.34.4.
00:05:27: DHCPD: BOOTREQUEST from 0063.6973.636f.2d63.6130.302e.3166.6338.2e30.3030.362d.4661.302f.31 forwarded to 192.168.34.5.
HTH,
__
Edison.
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