lowfell
asked on
are static routes necessary with eigrp? 500 points
I have just setup a leased line where previous to the leased line being built one of the routers had a default route to an adsl router. Now that the leased line is up I want to point the default route away from the adsl line and send it up the leased line through the serial interface. I am running eigrp on the network is it still necessary to add a static route?
Here is my current config!
interface FastEthernet0/0
ip address 10.4.254.254 255.255.0.0
no ip redirects
no ip unreachables
no ip proxy-arp
ip inspect basicfw in
ip nat inside
ip virtual-reassembly
ip route-cache flow
ip tcp adjust-mss 1460
duplex auto
speed auto
no mop enabled
!
interface FastEthernet0/1
ip address 192.168.1.2 255.255.255.0
no ip redirects
no ip unreachables
no ip proxy-arp
ip nat outside
ip virtual-reassembly
ip route-cache flow
duplex auto
speed auto
no cdp enable
no mop enabled
!
interface Serial0/0/0:0
ip address 192.168.4.2 255.255.255.252
!
router eigrp 10
network 10.4.0.0 0.0.255.255
network 192.168.4.0 0.0.0.3
network 192.168.4.0
no auto-summary
!
ip classless
ip route 0.0.0.0 0.0.0.0 192.168.1.1
Here is my current config!
interface FastEthernet0/0
ip address 10.4.254.254 255.255.0.0
no ip redirects
no ip unreachables
no ip proxy-arp
ip inspect basicfw in
ip nat inside
ip virtual-reassembly
ip route-cache flow
ip tcp adjust-mss 1460
duplex auto
speed auto
no mop enabled
!
interface FastEthernet0/1
ip address 192.168.1.2 255.255.255.0
no ip redirects
no ip unreachables
no ip proxy-arp
ip nat outside
ip virtual-reassembly
ip route-cache flow
duplex auto
speed auto
no cdp enable
no mop enabled
!
interface Serial0/0/0:0
ip address 192.168.4.2 255.255.255.252
!
router eigrp 10
network 10.4.0.0 0.0.255.255
network 192.168.4.0 0.0.0.3
network 192.168.4.0
no auto-summary
!
ip classless
ip route 0.0.0.0 0.0.0.0 192.168.1.1
If 192.168.1.1 is sending you a default route, then you don't need the static route. If it isn't then you should ideally set it up a default route on the remote router and redistribute it into eigrp.
>I am running eigrp on the network is it still necessary to add a static route?
The whole idea of running any dynamic routing protocol is to do away with statics, except in your case the one default route. If you advertise this default route through eigrp to all the other routers, they will not need any statics at all.
However, I don't see where you are advertising your local 192.168.1.x subnet to the rest of the network.
To redistribute your local lan and a default :
Given:
ip route 0.0.0.0 0.0.0.0 192.168.1.1
router eigrp 10
redistribute static <== send default
redistribute connected <== advertise local 192.168.1.0 subnet
The whole idea of running any dynamic routing protocol is to do away with statics, except in your case the one default route. If you advertise this default route through eigrp to all the other routers, they will not need any statics at all.
However, I don't see where you are advertising your local 192.168.1.x subnet to the rest of the network.
To redistribute your local lan and a default :
Given:
ip route 0.0.0.0 0.0.0.0 192.168.1.1
router eigrp 10
redistribute static <== send default
redistribute connected <== advertise local 192.168.1.0 subnet
ASKER
Sorry, although ip route 0.0.0.0 0.0.0.0 192.168.1.1 is the current default, I want to drop this route because it points to the adsl line. I now want all traffic to go down the leased line where the other side is 192.168.4.1. I still want to use the original default route as a backup. I suppose ican do this by adding a wait to it?
OK, the router that is a .4.1 will have a default and redistribute it.
Your end can add a higher admin cost the current default.
I think you meant "weight" where you said "wait" ?
no ip route 0.0.0.0 0.0.0.0 192.168.1.1
ip route 0.0.0.0 0.0.0.0 192.168.1.1 120 <== 120 is higher cost than EIGRP's 90
so it will only use this route if the other one goes away
Your end can add a higher admin cost the current default.
I think you meant "weight" where you said "wait" ?
no ip route 0.0.0.0 0.0.0.0 192.168.1.1
ip route 0.0.0.0 0.0.0.0 192.168.1.1 120 <== 120 is higher cost than EIGRP's 90
so it will only use this route if the other one goes away
ASKER
The default route that points to
0.0.0.0 0.0.0.0 192.168.1.1
This points to an adsl line that I no longer wish to use!
I am no longer bothered about the the 192.168.1 network, as the adsl was only in place until we got the leased line working!
I now want ALL my traffic to go via the SERIAL 0/0/0:0
and only want to include the lan network
10.4.0.0 255.255.0.0 and the serial interface
192.168.40 0.0.0.3
The eigrp is set as
router eigrp 10
network 10.4.0.0 0.0.255.255
network 192.168.4.0 0.0.0.3
network 192.168.4.0
no auto-summary
If I "NO" the current default route, will my eigrp settings do the rest, or is a new default route still needed?
Also if i still wanted to use the adsl as a backup could I as you said put the old default route back on but change the admin distance to 120.
Does the fact that a default route has been added make the eigrp useless, as this default route will always be preferred over the eigrp?
Also for future reference. Does using default routes make eigrp invalid and
vice versa?
Isn't it right to say that by using eigrp it is not necessary to use default and static routes?
Thanks chaps I really appreciate the help
0.0.0.0 0.0.0.0 192.168.1.1
This points to an adsl line that I no longer wish to use!
I am no longer bothered about the the 192.168.1 network, as the adsl was only in place until we got the leased line working!
I now want ALL my traffic to go via the SERIAL 0/0/0:0
and only want to include the lan network
10.4.0.0 255.255.0.0 and the serial interface
192.168.40 0.0.0.3
The eigrp is set as
router eigrp 10
network 10.4.0.0 0.0.255.255
network 192.168.4.0 0.0.0.3
network 192.168.4.0
no auto-summary
If I "NO" the current default route, will my eigrp settings do the rest, or is a new default route still needed?
Also if i still wanted to use the adsl as a backup could I as you said put the old default route back on but change the admin distance to 120.
Does the fact that a default route has been added make the eigrp useless, as this default route will always be preferred over the eigrp?
Also for future reference. Does using default routes make eigrp invalid and
vice versa?
Isn't it right to say that by using eigrp it is not necessary to use default and static routes?
Thanks chaps I really appreciate the help
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I like the idea of having a static default route, with a weight greater than any learned route.
You could have the ADSL also, with an even greater weight, as a backup.
You could have the ADSL also, with an even greater weight, as a backup.