From: Ефременко
Date: Tue Aug 02 2005 - 18:10:19 GMT-3
Hi Arun,
Interesting question.
I make some tests and achieve the same result.
I have 150.50.200.0/24&172.30.1.0/24-R1->R2->R4->{eigrp-cloud}->150.50.4.0/24
R1 and R2 routers use eigrp auto-summary but R4 and all other not.
On R1 I include 150.50.200.0/24 in to eigrp process and redistribute 172.30.1.0/24
So, I get following table
172.30.0.0/24 is subnetted, 1 subnets
D EX 172.30.1.0 [170/2300416] via 216.30.1.2, 00:00:52, Serial0/1/0
D EX 150.50.4.0/24 [170/2195456] via 216.30.1.6, 01:17:42, Serial0/1/0
[170/2195456] via 216.30.1.5, 01:17:42, Serial0/1/0
D 150.50.0.0/16 [90/2174976] via 216.30.1.2, 00:20:43, Serial0/1/0
R4 is a hub router
I foud answer in this book:
Cisco Press
Ivan Papelnijak
'EIGRP Network Design Solutions'
p. 175
'EIGRP autosummarisation Rule 4 - Subnets that do not belong to any of the networks listed in EIGRP process defenition are not summarized'
--- Best regards, Alexey> -----Original Message----- > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of > Arun Arumuganainar > Sent: Tuesday, August 02, 2005 7:39 PM > To: ccielab@groupstudy.com > Subject: EIGRP auto-summary and External EIGRP Routes > > Hi , > > I need a clarification . What is expected behavior on EIGRP auto-summary > on > external eigrp routes ??? As per my understanding , EIGRP will always > summarize routes at the state full boundary . Is my understanding correct > ???? or Wondering if External EIGRP routes are exception . > > My Topology . > > R1---------R2 > > Both R1 and R2 run EIGRP ( AS= 100) . Additionally R2 Runs RIP as well . > And > I am redistributing the following RIP routes in to EIGRP AS 100 . > > > =========================================== > > R2# sh ip route 200.3.3.0 longer-prefixes > Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP > D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area > N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 > E1 - OSPF external type 1, E2 - OSPF external type 2 > i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter > area > * - candidate default, U - per-user static route, o - ODR > P - periodic downloaded static route > > Gateway of last resort is not set > > 200.3.3.0/27 is subnetted, 6 subnets > R 200.3.3.128 [120/1] via 192.168.30.100, 00:00:12, BVI30 > R 200.3.3.160 [120/1] via 192.168.30.100, 00:00:12, BVI30 > R 200.3.3.64 [120/1] via 192.168.30.100, 00:00:12, BVI30 > R 200.3.3.96 [120/1] via 192.168.30.100, 00:00:12, BVI30 > R 200.3.3.0 [120/1] via 192.168.30.100, 00:00:12, BVI30 > R 200.3.3.32 [120/1] via 192.168.30.100, 00:00:12, BVI30 > =================================== > > My eigrp configuration at R2 looks like this . > > =================================== > > router eigrp 100 > redistribute rip route-map bb3 > network 139.10.20.0 0.0.0.255 > default-metric 10000 100 200 200 1500 > auto-summary > ! I have enabled auto summary here > ! > ip prefix-list bb3-routes seq 5 permit 200.3.3.0/24 ge 26 le 28 > ! > ! > route-map bb3 permit 10 > match ip address prefix-list bb3-routes > ! > =================================== > > At R1 I am not able to see routes summaraised . > =================================== > Router1 Trace > ================================== > R1#sh ip route eigrp > 139.10.0.0/24 is subnetted, 5 subnets > D 139.10.20.0 [90/409600] via 139.10.12.2, 00:13:07, Ethernet3/0 > 200.3.3.0/27 is subnetted, 6 subnets > D EX 200.3.3.128 [170/307200] via 139.10.12.2, 00:13:07, Ethernet3/0 > D EX 200.3.3.160 [170/307200] via 139.10.12.2, 00:13:07, Ethernet3/0 > D EX 200.3.3.64 [170/307200] via 139.10.12.2, 00:13:07, Ethernet3/0 > D EX 200.3.3.96 [170/307200] via 139.10.12.2, 00:13:07, Ethernet3/0 > D EX 200.3.3.0 [170/307200] via 139.10.12.2, 00:13:07, Ethernet3/0 > D EX 200.3.3.32 [170/307200] via 139.10.12.2, 00:13:07, Ethernet3/0 > > Thanks and Regards > Arun > > _______________________________________________________________________ > Subscription information may be found at: > http://www.groupstudy.com/list/CCIELab.html
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