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IS-IS and OSPF redistribution weirdness.... posted 01/10/2001
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<P>Hi All,</P></DIV>
<P>I was working with redistribution between OSPF and IS-IS domains and got this route in the table and wondered if anyone have seen this and could explain. I?m using the example from Slattery/Burton pg 297 (ex. #10). I?ve replace the EIGRP process with and Isis and in summarizing the ospf routes into isis I get the following in the RIB of the router doing the sumarization?</P>
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<P><FONT face="Geneva, Arial, Sans-serif">r2_01#sh ip ro</FONT></P>
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<P><FONT face="Geneva, Arial, Sans-serif">172.16.0.0/16 is variably subnetted, 9 subnets, 5 masks</FONT></P>
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<P><FONT face="Geneva, Arial, Sans-serif">O IA 172.16.2.252/30 [110/139] via 172.16.254.1, 02:35:35, Ethernet0</FONT></P>
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<P><FONT face="Geneva, Arial, Sans-serif">C 172.16.254.0/24 is directly connected, Ethernet0</FONT></P>
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<P><FONT face="Geneva, Arial, Sans-serif">C 172.16.253.4/30 is directly connected, Loopback0</FONT></P>
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<P><FONT face="Geneva, Arial, Sans-serif">O 172.16.253.9/32 [110/11] via 172.16.254.1, 02:35:35, Ethernet0</FONT></P>
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<P><FONT face="Geneva, Arial, Sans-serif">O IA 172.16.2.32/27 [110/144] via 172.16.254.1, 02:35:35, Ethernet0</FONT></P>
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<P><FONT face="Geneva, Arial, Sans-serif">O IA 172.16.2.4/30 [110/202] via 172.16.254.1, 02:35:35, Ethernet0</FONT></P><B>
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<P><FONT face="Geneva, Arial, Sans-serif">i su 172.16.0.0/16 [115/30] via 0.0.0.0, Null0</FONT></P></B>
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<P><FONT face="Geneva, Arial, Sans-serif">O IA 172.16.1.0/24 [110/74] via 172.16.254.1, 02:35:36, Ethernet0</FONT></P>
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<P><FONT face="Geneva, Arial, Sans-serif">O IA 172.16.2.0/24 [110/138] via 172.16.254.1, 02:35:36, Ethernet0</FONT></P>
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<P><FONT face="Geneva, Arial, Sans-serif">182.18.0.0/16 is variably subnetted, 6 subnets, 2 masks</FONT></P>
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<P><FONT face="Geneva, Arial, Sans-serif">i L1 182.18.4.0/24 [115/20] via 182.18.1.1, Serial1</FONT></P>
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<P><FONT face="Geneva, Arial, Sans-serif">i L1 182.18.5.0/24 [115/20] via 182.18.2.2, Serial0</FONT></P>
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<P><FONT face="Geneva, Arial, Sans-serif">O 182.18.0.0/16 is a summary, 02:21:02, Null0</FONT></P>
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<P><FONT face="Geneva, Arial, Sans-serif">C 182.18.1.0/24 is directly connected, Serial1</FONT></P>
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<P><FONT face="Geneva, Arial, Sans-serif">C 182.18.2.0/24 is directly connected, Serial0</FONT></P>
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<P><FONT face="Geneva, Arial, Sans-serif">i L1 182.18.3.0/24 [115/20] via 182.18.2.2, Serial0</FONT></P>
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<P><FONT face="Geneva, Arial, Sans-serif">[115/20] via 182.18.1.1, Serial1</FONT></P>
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<P>&nbsp;</P>
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<P>r4_02c#sh ip ro</P>
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<P>Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP</P>
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<P>D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area </P>
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<P>N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2</P>
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<P>E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP</P>
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<P>i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default</P>
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<P>U - per-user static route, o - ODR</P>
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<P>Gateway of last resort is not set</P>
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<P>i L2 172.16.0.0/16 [115/40] via 182.18.1.2, Serial0</P>
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<P>182.18.0.0/16 is variably subnetted, 6 subnets, 2 masks</P>
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<P>C 182.18.4.0/24 is directly connected, TokenRing0</P>
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<P>i L1 182.18.5.0/24 [115/20] via 182.18.3.1, Serial1</P>
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<P>i L2 182.18.0.0/16 [115/40] via 182.18.1.2, Serial0</P>
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<P>C 182.18.1.0/24 is directly connected, Serial0</P>
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<P>i L1 182.18.2.0/24 [115/20] via 182.18.3.1, Serial1</P>
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<P>[115/20] via 182.18.1.2, Serial0</P>
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<P>C 182.18.3.0/24 is directly connected, Serial</P><B>
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<P>i su 172.16.0.0/16 [115/30] via 0.0.0.0, Null0</P></B>
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<P>I?m thinking that this route is being suppressed but on the connected isis routers within it?s routing domain I get this summarized route to the ospf networks. </P>
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<P>What does the "su" represent in the table. And if this is being suppressed why is it showing up in the RIB at all. I know BGP allows the suppression of routes and was unaware that IGP?s did this as well. Is this only specific to isis..?</P>
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<P>Has anyone encountered this and knows what it means. Off to check the RFC?s.</P>
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<P>&nbsp;</P>
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<P>Nigel..</P>
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