nanog mailing list archives
RE: Cisco >224.0/3 problems..
From: "Martin, Christian" <CMartin () mercury balink com>
Date: Mon, 1 Feb 1999 17:56:15 -0500
Did you try ip mroute? RES-RTR6(config)#ip mroute 224.0.0.0 255.255.0.0 Null0 RES-RTR6(config)#no ip mroute 224.0.0.0 255.255.0.0 Null0 RES-RTR6(config)#^Z RES-RTR6# Feb 1 17:53:56 EST: %SYS-5-CONFIG_I: Configured from console by chris on consol e RES-RTR6# RES-RTR6#conf t Enter configuration commands, one per line. End with CNTL/Z. RES-RTR6(config)#no ip multicast-rou RES-RTR6(config)#ip mroute ? A.B.C.D Source address RES-RTR6(config)#ip mroute 224.0.0.0 224.0.0.0 null 0 RES-RTR6(config)#ip multicast-rou RES-RTR6(config)#no ip mroute 224.0.0.0 224.0.0.0 null0 RES-RTR6(config)#^Z RES-RTR6#
-----Original Message----- From: James Rishaw [mailto:jamie () dilbert ais net] Sent: Monday, February 01, 1999 2:07 PM To: nanog () merit edu Subject: Cisco >224.0/3 problems.. Hello all, Ran into a problem, thought maybe someone else has run into this and knows of a "fix", if this is intentional or what not. It seems that Cisco IOS has a problem dealing with addresses above 224.0.0.0/3. This came up in an e-mail with Paul Vixie about MAPS RBL, where I asked him why 224+ wasn't filtered. The reply was: IOS ignores it. GateD likes it, IOS doesn't. I'm finding that IOS isn't propagating routes, etc., (nor will it even seem to *recognize*) address space above 224. To wit: As a /3: bordercore1.chi(config)#ip route 224.0.0.0 224.0.0.0 Null0 %Invalid destination prefix /8, close to the end of address space: bordercore1.chi(config)#ip route 252.0.0.0 255.0.0.0 null0 %Invalid destination prefix As a /24: bordercore1.chi(config)#ip route 225.0.0.0 255.255.255.0 Null0 %Invalid destination prefix bordercore1.chi(config)#ip route 230.0.0.0 255.255.255.0 Null0 %Invalid destination prefix It's not Null0: bordercore1.chi(config)#ip route 234.128.230.123 255.255.255.255 h9/0 %Invalid destination prefix bordercore1.chi(config)#ip route 241.102.34.93 255.255.255.255 atm4/0 %Invalid destination prefix I know this is all "multicast" space, but considering classless routing and CIDR, shouldn't this space be usable and able to be manipulated ? -jamie -- jamie rishaw (efnet:gavroche) @ AIS / Exodus "I want peace on earth and goodwill towards men." "We are the United States Government. We don't do that sort of thing." --sneakers
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- RE: Cisco >224.0/3 problems.. Martin, Christian (Feb 01)