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Article #1816

Routing costs and default IP network list order

#1816
From: Mike Powell "CFS Net Ops"
Date: Fri, 28 Jun 1991 22:29
57 lines
2654 bytes
Here is the info:
GS Software (GS2-FX), Version 8.1(21) (sorry Patrick, no 8.2.4 on this one yet)
Copyright (c) 1986-1990 by cisco Systems, Inc.
Compiled Tue 28-Aug-90 21:27

System Bootstrap, Version 4.2(4)

zippy2 uptime is 1 week, 4 days, 7 hours, 51 minutes
System restarted by bus error at PC 0x50A0, address 0x4700000
Running default software

CSC3 (68020) processor with 4096K bytes of memory.
X.25 software.
1 MCI controller.
1 cBus controller.
6 Ethernet/IEEE 802.3 interface.
4 Serial network interface.
Environmental Controller.
64K bytes of multibus memory.
64K bytes of non-volatile configuration memory.
Configuration register is 0x101


Routes:
Gateway of last resort is 128.167.35.1 to network 192.80.214.0

I*Net 129.140.0.0 [100/18476] via 128.167.35.1, 87 sec, 9571 uses, Serial2 
I*Net 192.80.214.0 [100/8576] via 128.167.35.1, 87 sec, 9326 uses, Serial2
R*Net 128.198.0.0 [120/4] via 131.131.10.18, 14 sec, 0 uses, Ethernet3
The entry that is not visible:
[R*Net 129.140.0.0 [120/6] via 131.131.10.18, ....., Ethernet3]

Default network list:
ip default-network 129.140.0.0
ip default-network 192.80.214.0
ip default-network 128.198.0.0

129.140.0.0 is the desired default net, because we have two routes to
it. this will allow us fast switch-over in case of a failure in our
primary link.

It appears the router is using the lowest cost route in the default-net
list, reguardless of list order.
What we want is the lowest cost route for the first entry in the
default-net list.
THe Manual for 8.1 says "The system will periodically scan its routing table
to choose the optimal default network as its default route."
I take this to mean the router is behaving the way it should.
Is the only way to get it the way I want it, to artificially bump up
the route to 192.80.214?
Enquiring minds want to know.
Mike
--
Mike Powell PPASEL
"It's hard to find router bits for your cisco." MRP 03/29/91
Disclaimer: I speak for myself. No direct relation to the DUAT folks.
internet: powell@wraith.netops.contel.com  Usenet: uunet!contel-fss!powell
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From: powell@wraith.netops.contel.com (Mike Powell "CFS Net Ops")
Newsgroups: comp.dcom.sys.cisco
Subject: Routing costs and default IP network list order
Message-ID: <910628173503@wraith.netops.contel.com>
Date: 28 Jun 91 22:29:00 GMT
Sender: news@europa.asd.contel.com (News)
Organization: GTE Contel Federal Systems (Telecom)
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