From: Bernard Dunn (dunn@xxxxxxxxx)
Date: Tue Jan 09 2001 - 11:57:31 GMT-3
Julie Ann,
Hope it is a typo - 0xFFFFFFFE should be -2.
Story behind it is that the network number is reserved in later IPX router
spec (which is the current spec, when Novell started supporting
NLSP) as the default route for ipx routes supporting the feature. So if
you use the command 'ipx advertise-default-route-only' on an interface,
then the downstream/neighbours will only receive the 0xFFFFFFE route. To
the rest of the network, there'd better not be a 0xFFFFFFFE.
So when you want the downstream routers to forward packets to destinations
that the router doesn't have a specific route to (or for a better
sentence, the routing table only has 0xFFFFFFFE, and the workstation
wants to send a packet to 13.0000.0000.0001), then configure the
global command 'ipx default-route' on the downstream router.
As to the qestion of how does it (the downstream router) know what the
default interface is? Just the ipx router that sent the default route:
Here's a sample:
faste atm vc token ring
r1 ------ r2
222 135 123
r1 assumes it has the default route (fudged with a static route).
<snip>
hostname r1
!
!
memory-size iomem 20
ip subnet-zero
!
!
no ip finger
no ip domain-lookup
!
ipx routing 0003.e320.f6c1
:
:
:
interface FastEthernet0/0
ip address 203.96.108.1 255.255.255.224
speed 100
full-duplex
ipx network 222
:
:
:
interface ATM1/0
no ip address
no atm scrambling cell-payload
no atm ilmi-keepalive
!
interface ATM1/0.1 multipoint
ip address 192.168.1.1 255.255.255.0
pvc 5/34
broadcast
encapsulation aal5snap
!
pvc 5/35
broadcast
encapsulation aal5snap
!
ipx network 135
ipx advertise-default-route-only 135
!
!
ipx route 444 222.0000.3222.1234
ipx route default 222.0000.3222.1234
!
!
r1#sh ipx route
Codes: C - Connected primary network, c - Connected secondary network
S - Static, F - Floating static, L - Local (internal), W - IPXWAN
R - RIP, E - EIGRP, N - NLSP, X - External, A - Aggregate
s - seconds, u - uses, U - Per-user static
5 Total IPX routes. Up to 1 parallel paths and 16 hops allowed.
Current default route is:
S FFFFFFFE via 222.0000.3222.1234, Fa0/0
C 135 (SNAP), AT1/0.1
C 222 (NOVELL-ETHER), Fa0/0
R 123 [02/01] via 135.0002.b933.eb01, 55s, AT1/0.1
S 444 via 222.0000.3222.1234, Fa0/0
</snip>
<snip>
hostname r2
!
logging rate-limit console 10 except errors
enable secret 5 $1$o.sP$jwCFjzp9S/mRI/EWrUxKt0
!
memory-size iomem 15
ip subnet-zero
!
!
no ip finger
!
ipx routing 0002.b933.eb01
interface TokenRing0/0
mtu 4464
ip address 64.10.1.1 255.255.0.0
ipx network 123
ring-speed 16
!
interface ATM1/0.1 multipoint
ip address 192.168.1.3 255.255.255.0
pvc 5/34
broadcast
encapsulation aal5snap
!
ipx network 135
!
r2#sh ipx route
Codes: C - Connected primary network, c - Connected secondary network
S - Static, F - Floating static, L - Local (internal), W - IPXWAN
R - RIP, E - EIGRP, N - NLSP, X - External, A - Aggregate
s - seconds, u - uses, U - Per-user static
3 Total IPX routes. Up to 1 parallel paths and 16 hops allowed.
Current default route is:
R FFFFFFFE [02/02] via 135.0003.e320.f6c1, 23s, AT1/0.1
C 123 (SAP), To0/0
C 135 (SNAP), AT1/0.1
On Tue, 9 Jan 2001, Connary, Julie Ann wrote:
> Hi All,
> Caslow mentions that "By default, IPX default-route is enabled and uses the
> network number 2 (0xfffffffe) as the default route. Also, by
> default, all RIP updates are still advertised out the default interface. I
> f you want to prevent this from happening, enter the
> following interface configuration command: ipx advertise-default-route-only
> network.
>
> How do you tell on a router if RIP is using this default and what the
> default interface is? Is this saying that
> if you do not issue ipx route default command RIP still advertises a
> default network?
>
>
> Oh I hate IPX. Ok, done whining.
>
> Julie Ann
>
>
> ------------------------------------------------------------------------
> Julie Ann Connary
> | | Network Consulting Engineer
> ||| ||| Federal Support Program
> .|||||. .|||||. 13635 Dulles Technology Drive,
> Herndon VA 20171
> .:|||||||||:.:|||||||||:. Pager: 1-888-642-0551
> c i s c o S y s t e m s Email: jconnary@cisco.com
>
> ------------------------------------------------------------------------
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