You may advertise a secondary address, but only if the primary is advertised as well. If you look at "debug ip packet" (or use a sniffer if this is production) you'll see that the device will ALWAYS use it's primary address as the source IP for packets going out that interface. Nothing in our routing configuration allows this to be changed. And Juniper has primary addresses because they don't have a concept of secondary addresses. :) But the primary command there serves a similar purpose for some things. HTH, Scott
_____ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Masood Ahmad Shah Sent: Wednesday, June 11, 2008 9:21 AM To: 'OSL CCIE Routing and Switching Lab Exam' Subject: [OSL | CCIE_RS] OSPF on Secondary IP address Can OSPF establish as neighbors on secondary addresses? Do not have any luck unless the OSPF network interface is primary. Any ideas why and how do we go around this? What if a ROUTERA is connected to a wireless bridge which is serving multiple sites . Or there can be many other situation when you need to build adjacency on secondary IP address instead of primary IP. Oops I don't have any parameter (when I configure secondary address on Cisco Router) like preferred/primary like we do on juniper routers ;) J Thanks in advance. Regards, Masood ------------- ROUTERA interface FastEthernet1 ip address 2.100.220.113 255.255.255.248 ip address 2.100.220.97 255.255.255.248 secondary ip address 2.100.230.81 255.255.255.248 secondary no ip redirects no ip directed-broadcast ! router ospf 100 log-adjacency-changes area 3.3.3.102 stub no-summary network 2.100.230.80 0.0.0.7 area 3.3.3.102 -------------- ROUTERB interface Ethernet0 ip address 2.100.230.86 255.255.255.248 ! router ospf 100 log-adjacency-changes area 3.3.3.102 stub passive-interface BRI0 network 2.100.230.80 0.0.0.7 area 3.3.3.102
