IS-IS and OSPF redistribution weirdness....

From: Nigel Taylor (nigel_taylor@xxxxxxxxxxx)
Date: Wed Jan 10 2001 - 03:05:44 GMT-3

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<html><DIV>
<P><BR><BR></P>
<DIV><FONT face=Arial></DIV>
<P>Hi All,</P></DIV>
<P>I was working with redistribution between OSPF and IS-IS domains and got thi
s 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). Ive replace the EIGR
P 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>
<DIV></DIV>
<P><FONT face="Geneva, Arial, Sans-serif">r2_01#sh ip ro</FONT></P>
<DIV></DIV>
<P><FONT face="Geneva, Arial, Sans-serif">172.16.0.0/16 is variably subnetted,
9 subnets, 5 masks</FONT></P>
<DIV></DIV>
<P><FONT face="Geneva, Arial, Sans-serif">O IA 172.16.2.252/30 [110/139] via 17
2.16.254.1, 02:35:35, Ethernet0</FONT></P>
<DIV></DIV>
<P><FONT face="Geneva, Arial, Sans-serif">C 172.16.254.0/24 is directly connect
ed, Ethernet0</FONT></P>
<DIV></DIV>
<P><FONT face="Geneva, Arial, Sans-serif">C 172.16.253.4/30 is directly connect
ed, Loopback0</FONT></P>
<DIV></DIV>
<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>
<DIV></DIV>
<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>
<DIV></DIV>
<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>
<DIV></DIV>
<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>
<DIV></DIV>
<P><FONT face="Geneva, Arial, Sans-serif">O IA 172.16.1.0/24 [110/74] via 172.1
6.254.1, 02:35:36, Ethernet0</FONT></P>
<DIV></DIV>
<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>
<DIV></DIV>
<P><FONT face="Geneva, Arial, Sans-serif">182.18.0.0/16 is variably subnetted,
6 subnets, 2 masks</FONT></P>
<DIV></DIV>
<P><FONT face="Geneva, Arial, Sans-serif">i L1 182.18.4.0/24 [115/20] via 182.1
8.1.1, Serial1</FONT></P>
<DIV></DIV>
<P><FONT face="Geneva, Arial, Sans-serif">i L1 182.18.5.0/24 [115/20] via 182.1
8.2.2, Serial0</FONT></P>
<DIV></DIV>
<P><FONT face="Geneva, Arial, Sans-serif">O 182.18.0.0/16 is a summary, 02:21:0
2, Null0</FONT></P>
<DIV></DIV>
<P><FONT face="Geneva, Arial, Sans-serif">C 182.18.1.0/24 is directly connected
, Serial1</FONT></P>
<DIV></DIV>
<P><FONT face="Geneva, Arial, Sans-serif">C 182.18.2.0/24 is directly connected
, Serial0</FONT></P>
<DIV></DIV>
<P><FONT face="Geneva, Arial, Sans-serif">i L1 182.18.3.0/24 [115/20] via 182.1
8.2.2, Serial0</FONT></P>
<DIV></DIV>
<P><FONT face="Geneva, Arial, Sans-serif">[115/20] via 182.18.1.1, Serial1</FON
T></P>
<DIV></DIV>
<P> </P>
<DIV></DIV>
<P>r4_02c#sh ip ro</P>
<DIV></DIV>
<P>Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP</P>
<DIV></DIV>
<P>D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area </P>
<DIV></DIV>
<P>N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2</P>
<DIV></DIV>
<P>E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP</P>
<DIV></DIV>
<P>i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default</P>
<DIV></DIV>
<P>U - per-user static route, o - ODR</P>
<DIV></DIV>
<P>Gateway of last resort is not set</P>
<DIV></DIV>
<P>i L2 172.16.0.0/16 [115/40] via 182.18.1.2, Serial0</P>
<DIV></DIV>
<P>182.18.0.0/16 is variably subnetted, 6 subnets, 2 masks</P>
<DIV></DIV>
<P>C 182.18.4.0/24 is directly connected, TokenRing0</P>
<DIV></DIV>
<P>i L1 182.18.5.0/24 [115/20] via 182.18.3.1, Serial1</P>
<DIV></DIV>
<P>i L2 182.18.0.0/16 [115/40] via 182.18.1.2, Serial0</P>
<DIV></DIV>
<P>C 182.18.1.0/24 is directly connected, Serial0</P>
<DIV></DIV>
<P>i L1 182.18.2.0/24 [115/20] via 182.18.3.1, Serial1</P>
<DIV></DIV>
<P>[115/20] via 182.18.1.2, Serial0</P>
<DIV></DIV>
<P>C 182.18.3.0/24 is directly connected, Serial</P><B>
<DIV></DIV>
<P>i su 172.16.0.0/16 [115/30] via 0.0.0.0, Null0</P></B>
<DIV></DIV>
<P>Im thinking that this route is being suppressed but on the connected isis ro
uters within its routing domain I get this summarized route to the ospf network
s. </P>
<DIV></DIV>
<P>What does the "su" represent in the table. And if this is being suppressed w
hy is it showing up in the RIB at all. I know BGP allows the suppression of rou
tes and was unaware that IGPs did this as well. Is this only specific to isis..
?</P>
<DIV></DIV>
<P>Has anyone encountered this and knows what it means. Off to check the RFCs.<
/P>
<DIV></DIV>
<P> </P>
<DIV></DIV>
<P>Nigel..</P>
<DIV></DIV>
<P></FONT><BR><BR></P>
<DIV></DIV>
<DIV></DIV>
<DIV></DIV>
<DIV></DIV>
<DIV></DIV>
<DIV></DIV>
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