The "neighbor" command is a "more-specific" command which works separate from the "passive-interface" command. So if you have RIP on an interface and only use the neighbor command, you will get BOTH a multicast and a unicast packet on that interface. RIP allows you to do ONLY unicast by using both of those together. HTH,
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, JNCIE-M #153, JNCIS-ER, CISSP, et al. CCSI/JNCI-M/JNCI-ER VP - Technical Training - IPexpert, Inc. IPexpert Sr. Technical Instructor A Cisco Learning Partner - We Accept Learning Credits! [EMAIL PROTECTED] Telephone: +1.810.326.1444 Fax: +1.810.454.0130 http://www.ipexpert.com _____ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of GAURAV MADAN Sent: Tuesday, March 04, 2008 5:43 AM To: [email protected] Subject: [OSL | CCIE_RS] RIP neighbor clearification Hi I am actually confused in usage of passive-int and neighbor command in case of RIP . I understand that if we use passive-interface for a given interface ; UPDATES will not be sent out that interface . The only usage that i can think of "neighbor" command is that on a broadcast network where we want non-broadcast exchange of routing info . i.e if we wanna establish rip relationship between particular rtrts ; then we can use it .. is there some other usage ?? actually am confused by usage given in CCO which says : router rip network 10.108.0.0 passive-interface ethernet 1 neighbor 10.108.20.4 In the above case ; if neighbor 10.108.20.4 is located out eth 1 .. still no RIP update will go to that router .. right ? Gaurav Madan.
