From: Daniel Garrity (ccie@garrityfamily.com)
Date: Sat Sep 14 2002 - 18:14:08 GMT-3
I have run into this exact problem. All documentation states that the
command summary-address is used to summarize networks
that are redistributed into OSPF. But, I have also seen labs where it is
used to summarize OSPF networks before their redistribution into FLSM
routing protocols (IGRP and RIP). Fatkid Redistribution 501 and Case
Study #3 from Cisco CCIE Lab Practice Kit (Satterlee and Hutnik) are
prime examples. Both use the summary-address to summarize a network
before redistribution into IGRP. Both examples are using IOS version
11.2. My lab is setup with IOS version 12.1 (15) and when I attempted
these labs both would not work using the summary-address command. I had
to use the area range command instead for the route to be redistributed
into IGRP.
In looking at the routing tables from the fatkid lab, provided by
fatkid. I noticed that his summarized network were showing up as a
summary entry in his table. On version 12.1, no such summary was
present.
To see if somehow the function of this command had changed, I reload my
ASBR router with IOS version 11.2 and checked the routing table. Sure
enough I now showed the summary route in the routing table. Also the
routes were now showing up in my IGRP table as well.
Somehow the function of this command has be changed to just allow
summarization into OSPF, instead of bi-directional summarization. Again,
all documentation states that the command summary-address is used to
summarize networks
that are redistributed into OSPF. So it looks like Cisco might have
adjusted the function of this to match it's original intent.
This is just conjecture on my part. If anyone has more concrete
information please help.
Dan Garrity
Copies of my show run and routing table are included.
The networks in question for this lab (fatkid 501) are 170.10.1.0 and
170.10.13.0.
NOTE: R4 is my ASBR and R1 is my IGRP backbone.
R4#wr t
Building configuration...
Current configuration : 2082 bytes
!
version 12.1
no service single-slot-reload-enable
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname R4
!
!
!
!
!
!
ip subnet-zero
ip tcp synwait-time 5
no ip domain-lookup
!
!
!
!
interface Loopback0
ip address 170.10.4.1 255.255.255.0
ip ospf network point-to-point
!
interface Ethernet0
ip address 170.10.13.4 255.255.255.192
!
interface Serial0
ip address 170.10.30.4 255.255.255.0
no fair-queue
!
interface Serial1
ip address 192.19.15.4 255.255.255.0
clockrate 64000
!
interface TokenRing0
ip address 170.10.20.4 255.255.255.0
ring-speed 16
!
router ospf 69
log-adjacency-changes
area 2 virtual-link 170.10.5.1
summary-address 170.10.1.0 255.255.255.0
summary-address 170.10.13.0 255.255.255.0
redistribute rip subnets
redistribute igrp 69 subnets
network 170.10.4.0 0.0.0.255 area 3
network 170.10.13.0 0.0.0.63 area 2
distribute-list disout out
!
router rip
redistribute ospf 69
redistribute igrp 69
passive-interface Ethernet0
passive-interface Loopback0
passive-interface Serial0
passive-interface Serial1
network 170.10.0.0
default-metric 3
!
router igrp 69
redistribute ospf 69
redistribute rip metric 1 10 125 125 1500
passive-interface Ethernet0
passive-interface Loopback0
passive-interface Serial1
passive-interface TokenRing0
network 170.10.0.0
default-metric 64 3 255 1 1500
!
ip classless
ip http server
!
!
ip access-list standard disout
route-map disout deny 10
match route-type external
!
!
alias exec r show ip route
alias exec xr show ipx route
alias exec c show running-config
alias exec i show ip int brief
alias exec xi show ipx int brief
alias exec o show ip ospf
alias exec t config term
alias exec b show ip bgp
alias exec e show ip eigrp
alias exec xe show ipx eigrp
!
line con 0
exec-timeout 0 0
privilege level 15
logging synchronous
length 42
line aux 0
privilege level 15
line vty 0 4
exec-timeout 0 0
privilege level 15
logging synchronous
no login
length 42
!
end
R4#show ip route
Codes: C - connected, S - static, I - IGRP, 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, E - EGP
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
170.10.0.0/16 is variably subnetted, 11 subnets, 3 masks
R 170.10.40.0/24 [120/1] via 170.10.20.3, 00:00:16, TokenRing0
O 170.10.1.0/28 [110/74] via 170.10.13.5, 00:03:02, Ethernet0
O E2 170.10.2.0/24 [110/20] via 170.10.13.5, 00:03:02, Ethernet0
R 170.10.3.0/24 [120/1] via 170.10.20.3, 00:00:16, TokenRing0
C 170.10.4.0/24 is directly connected, Loopback0
O 170.10.5.0/24 [110/11] via 170.10.13.5, 00:03:02, Ethernet0
O E2 170.10.12.0/24 [110/20] via 170.10.13.5, 00:03:03, Ethernet0
C 170.10.13.0/26 is directly connected, Ethernet0
C 170.10.20.0/24 is directly connected, TokenRing0
I 170.10.21.0/24 [100/8976] via 170.10.30.1, 00:01:07, Serial0
C 170.10.30.0/24 is directly connected, Serial0
C 192.19.15.0/24 is directly connected, Serial1
R4#
R1#
R1#show ip route
Codes: C - connected, S - static, I - IGRP, 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, E - EGP
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
170.10.0.0/24 is subnetted, 10 subnets
I 170.10.40.0 [100/10002010] via 170.10.30.4, 00:00:22, Serial3
I 170.10.2.0 [100/158253] via 170.10.30.4, 00:00:22, Serial3
I 170.10.3.0 [100/10002010] via 170.10.30.4, 00:00:22, Serial3
I 170.10.4.0 [100/89456] via 170.10.30.4, 00:00:22, Serial3
I 170.10.5.0 [100/158253] via 170.10.30.4, 00:00:22, Serial3
I 170.10.12.0 [100/158253] via 170.10.30.4, 00:00:22, Serial3
I 170.10.13.0 [100/10002010] via 170.10.30.4, 00:00:22, Serial3
I 170.10.20.0 [100/89019] via 170.10.30.4, 00:00:23, Serial3
C 170.10.21.0 is directly connected, Loopback0
C 170.10.30.0 is directly connected, Serial3
R1#
With Version 11.2
R4#
R4#wr t
Building configuration...
Current configuration:
!
version 11.2
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
no service udp-small-servers
no service tcp-small-servers
!
hostname R4
!
!
ip subnet-zero
ip tcp synwait-time 5
no ip domain-lookup
!
interface Loopback0
ip address 170.10.4.1 255.255.255.0
!
interface Ethernet0
ip address 170.10.13.4 255.255.255.192
!
interface Serial0
ip address 170.10.30.4 255.255.255.0
no fair-queue
!
interface Serial1
ip address 192.19.15.4 255.255.255.0
clockrate 64000
!
interface TokenRing0
ip address 170.10.20.4 255.255.255.0
ring-speed 16
!
router ospf 69
summary-address 170.10.1.0 255.255.255.0
summary-address 170.10.13.0 255.255.255.0
redistribute rip subnets
redistribute igrp 69 subnets
network 170.10.4.0 0.0.0.255 area 3
network 170.10.13.0 0.0.0.63 area 2
distribute-list disout out
area 2 virtual-link 170.10.5.1
!
router rip
redistribute ospf 69
redistribute igrp 69
passive-interface Ethernet0
passive-interface Loopback0
passive-interface Serial0
passive-interface Serial1
network 170.10.0.0
default-metric 3
!
router igrp 69
redistribute ospf 69
redistribute rip metric 1 10 125 125 1500
passive-interface Ethernet0
passive-interface Loopback0
passive-interface Serial1
passive-interface TokenRing0
network 170.10.0.0
default-metric 64 3 255 1 1500
!
ip classless
ip http server
!
ip access-list standard disout
route-map disout deny 10
match route-type external
!
!
alias exec r show ip route
alias exec xr show ipx route
alias exec c show running-config
alias exec i show ip int brief
alias exec xi show ipx int brief
alias exec o show ip ospf
alias exec t config term
alias exec b show ip bgp
alias exec e show ip eigrp
alias exec xe show ipx eigrp
!
line con 0
exec-timeout 0 0
privilege level 15
logging synchronous
length 42
line aux 0
privilege level 15
line vty 0 4
exec-timeout 0 0
privilege level 15
logging synchronous
no login
length 42
!
end
R4#show ip route
Codes: C - connected, S - static, I - IGRP, 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, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate
default
U - per-user static route, o - ODR
Gateway of last resort is not set
170.10.0.0/16 is variably subnetted, 13 subnets, 3 masks
R 170.10.40.0/24 [120/1] via 170.10.20.3, 00:00:11, TokenRing0
O 170.10.1.0/28 [110/74] via 170.10.13.5, 00:01:50, Ethernet0
O 170.10.1.0/24 is a summary, 00:02:39, Null0
O E2 170.10.2.0/24 [110/20] via 170.10.13.5, 00:01:50, Ethernet0
R 170.10.3.0/24 [120/1] via 170.10.20.3, 00:00:11, TokenRing0
C 170.10.4.0/24 is directly connected, Loopback0
O 170.10.5.0/24 [110/11] via 170.10.13.5, 00:02:15, Ethernet0
O E2 170.10.12.0/24 [110/20] via 170.10.13.5, 00:01:50, Ethernet0
C 170.10.13.0/26 is directly connected, Ethernet0
O 170.10.13.0/24 is a summary, 00:02:40, Null0
C 170.10.20.0/24 is directly connected, TokenRing0
I 170.10.21.0/24 [100/8976] via 170.10.30.1, 00:00:28, Serial0
C 170.10.30.0/24 is directly connected, Serial0
C 192.19.15.0/24 is directly connected, Serial1
R4#
R1#show ip route
Codes: C - connected, S - static, I - IGRP, 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, E - EGP
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
170.10.0.0/24 is subnetted, 11 subnets
I 170.10.40.0 [100/10002010] via 170.10.30.4, 00:00:55, Serial3
I 170.10.1.0 [100/158253] via 170.10.30.4, 00:00:55, Serial3
I 170.10.2.0 [100/158253] via 170.10.30.4, 00:00:55, Serial3
I 170.10.3.0 [100/10002010] via 170.10.30.4, 00:00:55, Serial3
I 170.10.4.0 [100/89456] via 170.10.30.4, 00:00:55, Serial3
I 170.10.5.0 [100/158253] via 170.10.30.4, 00:00:55, Serial3
I 170.10.12.0 [100/158253] via 170.10.30.4, 00:00:55, Serial3
I 170.10.13.0 [100/158253] via 170.10.30.4, 00:00:56, Serial3
I 170.10.20.0 [100/89019] via 170.10.30.4, 00:00:56, Serial3
C 170.10.21.0 is directly connected, Loopback0
C 170.10.30.0 is directly connected, Serial3
R1#
-----Original Message-----
From: Claudine DEMAR [mailto:lkcnet00@hotmail.com]
Sent: Friday, September 13, 2002 5:14 AM
To: ccielab@groupstudy.com
Subject: OSPF summary-address and redistribution
Hello,
Quick a confirmation regarding the OSPF summary-address command.
I've read everwhere that this command is only used to summarise networks
that are redistributed into OSPF. Netherless, I could see some
corrections(like the fatkid red501) where it seems that this command is
used
to summarise OSPF networks before their redistribution into another RP.
Trying it imy lab, I can not make this work. Can anybody confirm that
the
summary address ONLY summarise networks that are redistributed into
OSPF. If
there are other use for this command, can you provide a good working
example. Maybe there's something else to be configured to make it work
...
Let me know.
Many thanks,
Claudine
This archive was generated by hypermail 2.1.4 : Mon Oct 07 2002 - 07:43:52 GMT-3