From: Brian Dennis (bdennis@internetworkexpert.com)
Date: Fri May 27 2005 - 15:11:05 GMT-3
The passive-interface command does not stop the advertisement of the
network itself. The passive-interface command suppresses the sending of
updates out the interface.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/
fiprrp_r/ind_r/1rfindp1.htm#wp1019734
If you do not want to advertise a network, use a distribute-list and not
the passive-interface command.
Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
bdennis@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987
Direct: 775-745-6404 (Outside the US and Canada)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
thomas.rader@freesurf.ch
Sent: Friday, May 27, 2005 10:55 AM
To: ccielab@groupstudy.com
Subject: RE: Issue with RIP & passive interface
Hi Kian,
Thanks, but I'm not sure I understand.
Are you saying that just because there is still a route to the
172.31.0.0 network, RIP will still send the 172.31.10.0/24 update to R8,
EVEN if I've told it not to using passive interface on R7's Ethernet ?
Somehow doesn't make sense.
Thanks, Thomas
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Kian Wah Lai
Sent: Friday, May 27, 2005 7:38 PM
To: thomas.rader@freesurf.ch; ccielab@groupstudy.com
Subject: RE: Issue with RIP & passive interface
Hi,
Per CCO,
To disable sending routing updates on an interface, use the
passive-interface command in router configuration mode.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft
/122
tcr/122tip2r/ind_r/p2ftind1.htm#wp1019734
In your case, you have enabled RIP on R7 FA0/0 with the network command.
Routing for Networks:
172.31.0.0
Thus, you have a route to it. In order to remove it, use an outbound
distribute list on your R7's RIP process, filtering the 172.31.10.0/24
network.
Regards,
Kian Wah
http://www.aces-star.com
Your Asia Pacific Rack Rental Source
Ace the CCIE Lab with it!
-----Original Message-----
From: thomas.rader@freesurf.ch [mailto:thomas.rader@freesurf.ch]
Sent: Saturday, May 28, 2005 1:24 AM
To: ccielab@groupstudy.com
Subject: Issue with RIP & passive interface
Hello group,
I'm having an issue with RIP and passive interfaces.
I hope someone can explain to me why this is not working.
I have two routers, R7 & R8 (connected via a serial crossover cable)
talking
RIPv2 to each other.
I don't want to advertise (via RIP) networks learned from R7's
FastEthernet 0/0, so under R7's RIP process, I add a passive statement
for this interface.
However, on R8 I'm still learning the 172.31.10.0/24 network, and I
can't understand why ?
Shouldn't the passive interface statement on R7, stop this route from
being advertised to R8 ?
Here's the relevant config bits:
R7:
interface FastEthernet0/0
ip address 172.31.10.2 255.255.255.0
!
router rip
version 2
passive-interface FastEthernet0/0
network 172.31.0.0
no auto-summary
R8:
router rip
version 2
network 172.31.0.0
network 210.8.8.0
no auto-summary
Why am I still learning 172.31.10.0 /24 on R8 ?
R1R8#show ip route
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
172.31.0.0/16 is variably subnetted, 3 subnets, 2 masks
C 172.31.7.0/28 is directly connected, Serial0/0
R 172.31.10.0/24 [120/1] via 172.31.7.1, 00:00:11, Serial0/0
C 172.31.8.0/24 is directly connected, FastEthernet0/0
210.8.8.0/32 is subnetted, 1 subnets
C 210.8.8.8 is directly connected, Loopback0
R1R8#
This shows that I am not running RIP on the Ethernet interface any
longer
(passive)
R1R7#show ip protocols
Routing Protocol is "ospf 100"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Router ID 210.7.7.7
Number of areas in this router is 1. 1 normal 0 stub 0 nssa
Maximum path: 4
Routing for Networks:
172.31.10.0 0.0.0.255 area 9
210.7.7.7 0.0.0.0 area 9
Routing Information Sources:
Gateway Distance Last Update
210.6.6.6 110 01:10:57
210.7.7.7 110 01:10:57
210.5.5.5 110 01:10:57
Distance: (default is 110)
Routing Protocol is "rip"
Sending updates every 30 seconds, next due in 12 seconds
Invalid after 180 seconds, hold down 180, flushed after 240
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Redistributing: rip
Default version control: send version 2, receive version 2
Interface Send Recv Triggered RIP Key-chain
Serial0/0 2 2
Automatic network summarization is not in effect
Maximum path: 4
Routing for Networks:
172.31.0.0
Passive Interface(s):
FastEthernet0/0
Routing Information Sources:
Gateway Distance Last Update
172.31.7.2 120 00:00:11
Distance: (default is 120)
R1R7#
Any help would be appreciated.
Thanks, Thomas
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