From: ccie2be (ccie2be@nyc.rr.com)
Date: Sun Oct 05 2003 - 13:28:39 GMT-3
Passive interface works the same way with Eigrp and igrp as it does with
RIP. I'm not 100% sure what effect it has with link state protocols - it
may prevent link state flooding out of passive interfaces but I'm not sure.
Of course, if you don't need link states flooded out a particular interface
make sure that the subnet of those interfaces aren't included under the
routing process.
HTH, dt
----- Original Message -----
From: "k c" <jwongccie@yahoo.com.hk>
To: "William Lijewski" <ccie8642@hotmail.com>; <ccielab@groupstudy.com>
Sent: Sunday, October 05, 2003 11:36 AM
Subject: Re: passive interface lo
> Thanks for your reply. How about eigrp (and other protocols)? I try to
debug eigrp, but cannot observe anything?
>
> int lo 0
> ip address 192.168.3.1 255.255.255.224
>
> With passive interface lo0
> 5w2d: IP-EIGRP: 192.168.1.128/27 - do advertise out FastEthernet1/0
> 5w2d: IP-EIGRP: Int 192.168.1.128/27 metric 28160 - 25600 2560
> 5w2d: IP-EIGRP: 192.168.1.96/27 - do advertise out FastEthernet1/0
> 5w2d: IP-EIGRP: 192.168.3.0/27 - don't advertise out FastEthernet1/0
> 5w2d: IP-EIGRP: 192.168.3.0/24 - do advertise out FastEthernet1/0
> 5w2d: IP-EIGRP: Int 192.168.3.0/24 metric 128256 - 256 128000
> 5w2d: IP-EIGRP: 192.168.1.128/27 - do advertise out FastEthernet1/0
> 5w2d: IP-EIGRP: Int 192.168.1.128/27 metric 28160 - 25600 2560
> 5w2d: IP-EIGRP: 192.168.1.96/27 - do advertise out FastEthernet1/0
> 5w2d: IP-EIGRP: 192.168.3.0/27 - don't advertise out FastEthernet1/0
> 5w2d: IP-EIGRP: 192.168.3.0/24 - do advertise out FastEthernet1/0
> 5w2d: IP-EIGRP: Int 192.168.3.0/24 metric 128256 - 256 128000
> 5w2d: IP-EIGRP: Processing incoming UPDATE packet
> 5w2d: IP-EIGRP: Int 192.168.1.32/27 M 30720 - 25600 5120 SM 28160 - 25600
2560
> 5w2d: IP-EIGRP: Int 80.1.1.0/24 M 158720 - 25600 133120 SM 156160 - 25600
130560
> 5w2d: IP-EIGRP: Int 81.1.1.0/24 M 158720 - 25600 133120 SM 156160 - 25600
130560
> 5w2d: IP-EIGRP: Int 192.168.1.0/27 M 33280 - 25600 7680 SM 30720 - 25600
5120
> 5w2d: IP-EIGRP: Ext 0.0.0.0/0 M 35840 - 25600 10240 SM 33280 - 25600 7680
> 5w2d: IP-EIGRP: Ext 150.150.1.0/24 M 35840 - 25600 10240 SM 33280 - 25600
7680
> 5w2d: IP-EIGRP: Ext 150.150.2.0/24 M 35840 - 25600 10240 SM 33280 - 25600
7680
> 5w2d: IP-EIGRP: Ext 11.1.1.0/24 M 35840 - 25600 10240 SM 33280 - 25600
7680
> 5w2d: IP-EIGRP: Ext 172.168.10.0/24 M 35840 - 25600 10240 SM 33280 - 25600
7680
> 5w2d: IP-EIGRP: Ext 172.168.64.0/18 M 35840 - 25600 10240 SM 33280 - 25600
7680
> 5w2d: IP-EIGRP: Ext 150.200.16.0/20 M 35840 - 25600 10240 SM 33280 - 25600
7680
> 5w2d: IP-EIGRP: Ext 192.168.1.0/24 M 35840 - 25600 10240 SM 33280 - 25600
7680
> 5w2d: IP-EIGRP: Ext 137.20.20.0/24 M 35840 - 25600 10240 SM 33280 - 25600
7680
> 5w2d: IP-EIGRP: Ext 150.100.32.2/32 M 35840 - 25600 10240 SM 33280 - 25600
7680
> 5w2d: IP-EIGRP: Ext 150.100.32.4/32 M 35840 - 25600 10240 SM 33280 - 25600
7680
> 5w2d: IP-EIGRP: Ext 150.100.32.10/32 M 35840 - 25600 10240 SM 33280 -
25600 7680
> 5w2d: IP-EIGRP: Int 192.168.1.32/27 metric 30720 - 25600 5120
> 5w2d: IP-EIGRP: Int 80.1.1.0/24 metric 158720 - 25600 133120
> 5w2d: IP-EIGRP: Int 81.1.1.0/24 metric 158720 - 25600 133120
> 5w2d: IP-EIGRP: Int 192.168.1.0/27 metric 33280 - 25600 7680
> 5w2d: IP-EIGRP: Ext 0.0.0.0/0 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 150.150.1.0/24 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 150.150.2.0/24 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 11.1.1.0/24 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 172.168.10.0/24 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 172.168.64.0/18 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 150.200.16.0/20 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 192.168.1.0/24 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 137.20.20.0/24 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 150.100.32.2/32 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 150.100.32.4/32 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 150.100.32.10/32 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: 192.168.1.128/27 - do advertise out FastEthernet1/0
> 5w2d: IP-EIGRP: Int 192.168.1.128/27 metric 28160 - 25600 2560
> 5w2d: IP-EIGRP: 192.168.1.96/27 - do advertise out FastEthernet1/0
> 5w2d: IP-EIGRP: 192.168.3.0/27 - don't advertise out FastEthernet1/0
> 5w2d: IP-EIGRP: 192.168.3.0/24 - do advertise out FastEthernet1/0
> 5w2d: IP-EIGRP: Int 192.168.3.0/24 metric 128256 - 256 128000
> 5w2d: IP-EIGRP: Int 192.168.1.32/27 metric 30720 - 25600 5120
> 5w2d: IP-EIGRP: Int 80.1.1.0/24 metric 158720 - 25600 133120
> 5w2d: IP-EIGRP: Int 81.1.1.0/24 metric 158720 - 25600 133120
> 5w2d: IP-EIGRP: Int 192.168.1.0/27 metric 33280 - 25600 7680
> 5w2d: IP-EIGRP: Ext 0.0.0.0/0 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 150.150.1.0/24 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 150.150.2.0/24 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 11.1.1.0/24 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 172.168.10.0/24 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 172.168.64.0/18 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 150.200.16.0/20 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 192.168.1.0/24 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 137.20.20.0/24 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 150.100.32.2/32 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 150.100.32.4/32 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 150.100.32.10/32 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Processing incoming UPDATE packet
> 5w2d: IP-EIGRP: Int 192.168.1.128/27 M 4294967295 - 25600 4294967295 SM
42949672
> 95 - 25600 4294967295
> 5w2d: IP-EIGRP: Int 192.168.3.0/24 M 4294967295 - 25600 4294967295 SM
4294967295
> - 25600 4294967295
> With "passive interface lo0"
> 5w2d: IP-EIGRP: 192.168.1.128/27 - do advertise out FastEthernet1/0
> 5w2d: IP-EIGRP: Int 192.168.1.128/27 metric 28160 - 25600 2560
> 5w2d: IP-EIGRP: 192.168.1.96/27 - do advertise out FastEthernet1/0
> 5w2d: IP-EIGRP: 192.168.3.0/27 - don't advertise out FastEthernet1/0
> 5w2d: IP-EIGRP: 192.168.3.0/24 - do advertise out FastEthernet1/0
> 5w2d: IP-EIGRP: Int 192.168.3.0/24 metric 128256 - 256 128000
> 5w2d: IP-EIGRP: 192.168.1.0/24 - poison advertise out FastEthernet1/0
> 5w2d: IP-EIGRP: Processing incoming UPDATE packet
> 5w2d: IP-EIGRP: Int 192.168.1.32/27 M 30720 - 25600 5120 SM 28160 - 25600
2560
> 5w2d: IP-EIGRP: Int 80.1.1.0/24 M 158720 - 25600 133120 SM 156160 - 25600
130560
> 5w2d: IP-EIGRP: Int 81.1.1.0/24 M 158720 - 25600 133120 SM 156160 - 25600
130560
> 5w2d: IP-EIGRP: Int 192.168.1.0/27 M 33280 - 25600 7680 SM 30720 - 25600
5120
> 5w2d: IP-EIGRP: Ext 0.0.0.0/0 M 35840 - 25600 10240 SM 33280 - 25600 7680
> 5w2d: IP-EIGRP: Ext 150.150.1.0/24 M 35840 - 25600 10240 SM 33280 - 25600
7680
> 5w2d: IP-EIGRP: Ext 150.150.2.0/24 M 35840 - 25600 10240 SM 33280 - 25600
7680
> 5w2d: IP-EIGRP: Ext 11.1.1.0/24 M 35840 - 25600 10240 SM 33280 - 25600
7680
> 5w2d: IP-EIGRP: Ext 172.168.10.0/24 M 35840 - 25600 10240 SM 33280 - 25600
7680
> 5w2d: IP-EIGRP: Ext 172.168.64.0/18 M 35840 - 25600 10240 SM 33280 - 25600
7680
> 5w2d: IP-EIGRP: Ext 150.200.16.0/20 M 35840 - 25600 10240 SM 33280 - 25600
7680
> 5w2d: IP-EIGRP: Ext 192.168.1.0/24 M 35840 - 25600 10240 SM 33280 - 25600
7680
> 5w2d: IP-EIGRP: 192.168.1.0/24 routing table not updated
> 5w2d: IP-EIGRP: Ext 137.20.20.0/24 M 35840 - 25600 10240 SM 33280 - 25600
7680
> 5w2d: IP-EIGRP: Ext 150.100.32.2/32 M 35840 - 25600 10240 SM 33280 - 25600
7680
> 5w2d: IP-EIGRP: Ext 150.100.32.4/32 M 35840 - 25600 10240 SM 33280 - 25600
7680
> 5w2d: IP-EIGRP: Ext 150.100.32.10/32 M 35840 - 25600 10240 SM 33280 -
25600 7680
> 5w2d: IP-EIGRP: Int 192.168.1.32/27 metric 30720 - 25600 5120
> 5w2d: IP-EIGRP: Int 80.1.1.0/24 metric 158720 - 25600 133120
> 5w2d: IP-EIGRP: Int 81.1.1.0/24 metric 158720 - 25600 133120
> 5w2d: IP-EIGRP: Int 192.168.1.0/27 metric 33280 - 25600 7680
> 5w2d: IP-EIGRP: Ext 0.0.0.0/0 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 150.150.1.0/24 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 150.150.2.0/24 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 11.1.1.0/24 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 172.168.10.0/24 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 172.168.64.0/18 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 150.200.16.0/20 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 137.20.20.0/24 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 150.100.32.2/32 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 150.100.32.4/32 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 150.100.32.10/32 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: 192.168.1.128/27 - do advertise out FastEthernet1/0
> 5w2d: IP-EIGRP: Int 192.168.1.128/27 metric 28160 - 25600 2560
> 5w2d: IP-EIGRP: 192.168.1.96/27 - do advertise out FastEthernet1/0
> 5w2d: IP-EIGRP: 192.168.3.0/27 - don't advertise out FastEthernet1/0
> 5w2d: IP-EIGRP: 192.168.3.0/24 - do advertise out FastEthernet1/0
> 5w2d: IP-EIGRP: Int 192.168.3.0/24 metric 128256 - 256 128000
> 5w2d: IP-EIGRP: 192.168.1.0/24 - poison advertise out FastEthernet1/0
> 5w2d: IP-EIGRP: Int 192.168.1.32/27 metric 30720 - 25600 5120
> 5w2d: IP-EIGRP: Int 80.1.1.0/24 metric 158720 - 25600 133120
> 5w2d: IP-EIGRP: Int 81.1.1.0/24 metric 158720 - 25600 133120
> 5w2d: IP-EIGRP: Int 192.168.1.0/27 metric 33280 - 25600 7680
> 5w2d: IP-EIGRP: Ext 0.0.0.0/0 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 150.150.1.0/24 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 150.150.2.0/24 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 11.1.1.0/24 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 172.168.10.0/24 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 172.168.64.0/18 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 150.200.16.0/20 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 137.20.20.0/24 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 150.100.32.2/32 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 150.100.32.4/32 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Ext 150.100.32.10/32 metric 35840 - 25600 10240
> 5w2d: IP-EIGRP: Processing incoming UPDATE packet
> 5w2d: IP-EIGRP: Int 192.168.1.128/27 M 4294967295 - 25600 4294967295 SM
42949672
> 95 - 25600 4294967295
> 5w2d: IP-EIGRP: Int 192.168.3.0/24 M 4294967295 - 25600 4294967295 SM
4294967295
> - 25600 4294967295
>
> William Lijewski <ccie8642@hotmail.com> wrote:
> Setting the Loopback as passive is basically going to stop the router from
> sending updates to the Loopback. Take a look at the 'debug ip rip' output
> below. This one is when the Loopback is not set as passive.
>
> r1#debug ip rip
> RIP protocol debugging is on
> r1#clear ip route *
> r1#
> 1d13h: RIP: sending request on Loopback0 to 255.255.255.255
> 1d13h: RIP: sending request on Ethernet0 to 255.255.255.255
> r1#
> 1d13h: RIP: sending v1 flash update to 255.255.255.255 via Ethernet0
> (10.100.10.
> 1)
> 1d13h: RIP: build flash update entries
> 1d13h: subnet 10.1.1.0 metric 1
> 1d13h: RIP: sending v1 flash update to 255.255.255.255 via Loopback0
> (10.1.1.1)
> 1d13h: RIP: build flash update entries
> 1d13h: subnet 10.100.10.0 metric 1
> r1#
> 1d13h: RIP: sending v1 update to 255.255.255.255 via Ethernet0
(10.100.10.1)
> 1d13h: RIP: build update entries
> 1d13h: subnet 10.1.1.0 metric 1
> 1d13h: RIP: sending v1 update to 255.255.255.255 via Loopback0 (10.1.1.1)
> 1d13h: RIP: build update entries
> 1d13h: subnet 10.100.10.0 metric 1
>
>
> Notice how its sending updates to the Loopback and the Ethernet. Now we'll
> make the Loopback passive:
>
>
>
> r1(config)#router rip
> r1(config-router)#passive-interface lo 0
> r1(config-router)#end
> r1#clear ip route *
> r1#
> 1d13h: RIP: sending request on Ethernet0 to 255.255.255.255
> r1#
> 1d13h: RIP: sending v1 flash update to 255.255.255.255 via Ethernet0
> (10.100.10.
> 1)
> 1d13h: RIP: build flash update entries
> 1d13h: subnet 10.1.1.0 metric 1
> r1#
> 1d13h: RIP: sending v1 update to 255.255.255.255 via Ethernet0
(10.100.10.1)
> 1d13h: RIP: build update entries
> 1d13h: subnet 10.1.1.0 metric 1
>
>
> Now that we have made the Loopback passive RIP is no longer sending
updates
> to the Loopback. Were saving the router a little bit of work this way. The
> Loopback address will still be sent out to our neighbors, the router just
> isn't going to spend time sending usless updates.
>
> Bill Lijewski
> CCIE #8642
> Network Learning Inc
> 5 Day R&S CCIE Bootcamp Instructor
>
>
>
> >From: k c
> >Reply-To: k c
> >To: ccielab@groupstudy.com
> >Subject: passive interface lo
> >Date: Fri, 3 Oct 2003 19:36:40 +0800 (CST)
> >
> >I have seen the command "passive interface lo0" configured in some
routing
> >protocols like rip, eigrp, ospf, isis. What does this mean? Loopback is
not
> >a physical interface, why make it passive? What is the theory behind?
> >
> >!u&V%*(+ &V%k(+!v=l)G VoiceMail Ew*o5|....
> >http://voicemail.yahoo.com.hk
> >
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This archive was generated by hypermail 2.1.4 : Mon Nov 24 2003 - 07:52:57 GMT-3