From: Luis Rueda (userlerueda@hotmail.com)
Date: Sun Oct 09 2005 - 13:10:37 GMT-3
You mean this example ?
Route Summarization Examples
A correct and an incorrect configuration example of route summarization are
provided.
Example 1: Correct Configuration
The following example shows how the ip summary-address rip router
configuration command works with automatic summary addressing in RIP,
starting in global configuration mode. In the example, the major network is
10.0.0.0. The summary address 10.2.0.0 overrides the automatic summary
address of 10.0.0.0, so that 10.2.0.0 is advertised out Ethernet interface 1
and 10.0.0.0 is not advertised.
----------------------------------------------------------------------------
---- Note If split horizon is enabled, neither automatic summary nor interface summary addresses (those configured with the ip summary-address rip router configuration command) are advertised.---------------------------------------------------------------------------- ----
Router(config)# router rip Router(config-router)# network 10.0.0.0 Router(config-router)# exit Router(config)# interface ethernet1 Router(config-if)# ip address 10.1.1.1 255.255.255.0 Router(config-if)# ip summary-address rip 10.2.0.0 255.255.0.0 Router(config-if)# no ip split-horizon Router(config-if)# exit
Be aware that they are ussing RIPv1 and they are not disabling auto-summarization. Try it like the example.
Luis
-----Original Message----- From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Pierre-Alex Sent: Sunday, October 09, 2005 8:40 AM To: ccielab@groupstudy.com Subject: Split-Horizon and summary rule ripv2
Has anyone checked the statement on Cisco doc that says " if split horizon is enabled, neither an automatic summary address nor the interface summary address is advertised.
http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/products_configuratio n _guide_chapter09186a00800ca760.html
I am finding otherwise:
-----------------------------------------------
! interface Loopback1 ip address 10.10.1.1 255.255.255.0 ! interface Loopback2 ip address 10.10.2.1 255.255.255.0 ! interface Loopback3 ip address 10.10.3.1 255.255.255.0 ! interface Loopback4 ip address 10.10.4.1 255.255.255.0
interface Ethernet2/0 ip address 10.126.23.1 255.255.255.0 ip summary-address rip 10.10.0.0 255.255.252.0 half-duplex end
Mar 13 22:12:52.543: RIP: build flash update entries *Mar 13 22:12:52.543: 10.126.2.0/29 via 0.0.0.0, metric 2, tag 0 *Mar 13 22:12:52.979: RIP: sending v2 update to 224.0.0.9 via Ethernet2/0 (10.126.23.1) *Mar 13 22:12:52.979: RIP: build update entries *Mar 13 22:12:52.979: 10.10.0.0/22 via 0.0.0.0, metric 1, tag 0 *Mar 13 22:12:52.979: 10.10.4.0/24 via 0.0.0.0, metric 1, tag 0 *Mar 13 22:12:52.979: 10.126.1.0/29 via 0.0.0.0, metric 1, tag 0 *Mar 13 22:12:52.979: 10.126.2.0/29 via 0.0.0.0, metric 2, tag 0 *Mar 13 22:12:57.823: RIP: sending v2 update to 224.0.0.9 via Ethernet2/0 (10.126.23.1) *Mar 13 22:12:57.823: RIP: build update entries *Mar 13 22:12:57.823: 10.10.0.0/22 via 0.0.0.0, metric 1, tag 0 *Mar 13 22:12:57.823: 10.10.4.0/24 via 0.0.0.0, metric 1, tag 0 *Mar 13 22:12:57.823: 10.126.1.0/29 via 0.0.0.0, metric 1, tag 0 *Mar 13 22:12:57.823: 10.126.2.0/29 via 0.0.0.0, metric 2, tag 0
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