Need Advice: Static Route Still in Routing Table?

Need Advice: Static Route Still in Routing Table?

Post by Alex » Sat, 17 Jul 1999 04:00:00



Hi everyone,

I have a Static route question and need some advice, the configuration
is like this:

  2514A-e0 ------ 1900 ------ e0-SUN SERVER-e1 ------ 1900 ------
e0-2514B
  10.1.1.1/24                          10.1.1.2/24
10.1.2.2/24                           10.1.2.1/24

The SUN SERVER has two Ethernet NIC cards, each has an IP address but in
different subnet, static routes is configured between the two NICs.

The switch is in its default setting, no VLANs (except the default VLAN
- VLAN1).

On 2514A:
ip route 10.1.2.0 255.255.255.0 10.1.1.2

On 2514B:
ip route 10.1.1.0 255.255.255.0 10.1.2.2

When everything is working, each static route shows in its respective
routing table. When I disconnect SUN-e0 from the switch, the static
route of 2514A still shows in its (the 2514A) routing table, so it will
still send packets destined to the 2.0 subnet through its e0 interface.

My question is how do I configure the 2514 to aware that the static
route is not valid when any of the NICs on the SUN server goes down.

Alex Yeung,  CCNP, MCSE
Network Engineer

 
 
 

Need Advice: Static Route Still in Routing Table?

Post by Alex Bakhti » Sat, 17 Jul 1999 04:00:00


Quote:>>>>> "A" == Alex  writes:

A> Hi everyone, I have a Static route question and need some advice, the
A> configuration is like this:

A>   2514A-e0 ------ 1900 ------ e0-SUN SERVER-e1 ------ 1900 ------
A> e0-2514B
A>   10.1.1.1/24 10.1.1.2/24
A> 10.1.2.2/24 10.1.2.1/24

A> The SUN SERVER has two Ethernet NIC cards, each has an IP address but in
A> different subnet, static routes is configured between the two NICs.

A> The switch is in its default setting, no VLANs (except the default VLAN
A> - VLAN1).

A> On 2514A: ip route 10.1.2.0 255.255.255.0 10.1.1.2

A> On 2514B: ip route 10.1.1.0 255.255.255.0 10.1.2.2

A> When everything is working, each static route shows in its respective
A> routing table. When I disconnect SUN-e0 from the switch, the static
A> route of 2514A still shows in its (the 2514A) routing table, so it will
A> still send packets destined to the 2.0 subnet through its e0 interface.

A> My question is how do I configure the 2514 to aware that the static
A> route is not valid when any of the NICs on the SUN server goes down.

        Use dynamic routing.

A> Alex Yeung, CCNP, MCSE Network Engineer

--
Best regards, -- Alex Bakhtin.
AMT Group, Cisco Systems Gold Partner, http://www.amt.ru

 
 
 

Need Advice: Static Route Still in Routing Table?

Post by Fabio bellin » Sat, 17 Jul 1999 04:00:00


Hello Alex,
Since the router interface trought wich the router is able to reach the
remote network is "UP line protocol UP", the static route is true. No chance
at all to remove it dinamically from the router routing table !
If you want have a REAL network table in your router, you have to implement
a dinamic routing protocol.
Since you are using Sun ws and a FIX mask in your ip address scheme, you
should consider to implement RIP.
So doing as soon as the ethernet sun server has disconnected from the
switch, whitin 3 rip update (90 ") the remote route will be declared down
and wihtin 5 RIP update the route will be remove from the routing table.

hopefull could help

Regards.
Fabio


>Hi everyone,

>I have a Static route question and need some advice, the configuration
>is like this:

>  2514A-e0 ------ 1900 ------ e0-SUN SERVER-e1 ------ 1900 ------
>e0-2514B
>  10.1.1.1/24                          10.1.1.2/24
>10.1.2.2/24                           10.1.2.1/24

>The SUN SERVER has two Ethernet NIC cards, each has an IP address but in
>different subnet, static routes is configured between the two NICs.

>The switch is in its default setting, no VLANs (except the default VLAN
>- VLAN1).

>On 2514A:
>ip route 10.1.2.0 255.255.255.0 10.1.1.2

>On 2514B:
>ip route 10.1.1.0 255.255.255.0 10.1.2.2

>When everything is working, each static route shows in its respective
>routing table. When I disconnect SUN-e0 from the switch, the static
>route of 2514A still shows in its (the 2514A) routing table, so it will
>still send packets destined to the 2.0 subnet through its e0 interface.

>My question is how do I configure the 2514 to aware that the static
>route is not valid when any of the NICs on the SUN server goes down.

>Alex Yeung,  CCNP, MCSE
>Network Engineer

 
 
 

Need Advice: Static Route Still in Routing Table?

Post by Todd VanDewerke » Sat, 17 Jul 1999 04:00:00


My question is why do you want to do that?  Is there another path available
for those packets to take?.  If so then you need to have a dynamic routing
protocol.  Now, between the 2514A and the Sun you have a 1900, how many
other devices do you have on that 1900?  If you don't want to run a routing
protocol then you could roll a cable between the 2514s and the Sun and redo
your static to point out the interface, that way when the Sun goes down the
routers interface will also go down.  If you do this, you might want to
readdress the subnets.

Just a thought

Todd

--
Todd C. VanDerwerken, CCNA
Systems Engineer
MSI Systems Integrators
14301 First National Pkwy, Suite 400
Omaha, Ne  68154

Fax:      (402) 965-2410       www.msiinet.com
Pager: (402)579-8060

Quote:> Hi everyone,

> I have a Static route question and need some advice, the configuration
> is like this:

>   2514A-e0 ------ 1900 ------ e0-SUN SERVER-e1 ------ 1900 ------
> e0-2514B
>   10.1.1.1/24                          10.1.1.2/24
> 10.1.2.2/24                           10.1.2.1/24

> The SUN SERVER has two Ethernet NIC cards, each has an IP address but in
> different subnet, static routes is configured between the two NICs.

> The switch is in its default setting, no VLANs (except the default VLAN
> - VLAN1).

> On 2514A:
> ip route 10.1.2.0 255.255.255.0 10.1.1.2

> On 2514B:
> ip route 10.1.1.0 255.255.255.0 10.1.2.2

> When everything is working, each static route shows in its respective
> routing table. When I disconnect SUN-e0 from the switch, the static
> route of 2514A still shows in its (the 2514A) routing table, so it will
> still send packets destined to the 2.0 subnet through its e0 interface.

> My question is how do I configure the 2514 to aware that the static
> route is not valid when any of the NICs on the SUN server goes down.

> Alex Yeung,  CCNP, MCSE
> Network Engineer

 
 
 

Need Advice: Static Route Still in Routing Table?

Post by Dr Vincent C Jones » Sun, 18 Jul 1999 04:00:00


Just out of curiosity, what are you trying to do here? If you are using
the Sun server as a router, why not just turn on routing (try "man
gated").

If the intent is to provide multihoming to the Sun server, why not
define a loopback port with an appropriate address not on either LAN and
turn on routing (both on the Sun and on the routers) so that if one LAN
or router goes down, users can reach it via the other router without
having to change the target address. Of course, local users on the same
LAN should use the LAN interface address instead of the loopback address
if they don't understand IP redirect or don't age it out properly.

If the need for static routes is security, there are ways to drive
static routes with dynamically learned routes without accepting or
otherwise using untrustworthy dynamic routing data.

V.C.Jones



>Hi everyone,

>I have a Static route question and need some advice, the configuration
>is like this:

>  2514A-e0 ------ 1900 ------ e0-SUN SERVER-e1 ------ 1900 ------
>e0-2514B
>  10.1.1.1/24                          10.1.1.2/24
>10.1.2.2/24                           10.1.2.1/24

>The SUN SERVER has two Ethernet NIC cards, each has an IP address but in
>different subnet, static routes is configured between the two NICs.

>The switch is in its default setting, no VLANs (except the default VLAN
>- VLAN1).

>On 2514A:
>ip route 10.1.2.0 255.255.255.0 10.1.1.2

>On 2514B:
>ip route 10.1.1.0 255.255.255.0 10.1.2.2

>When everything is working, each static route shows in its respective
>routing table. When I disconnect SUN-e0 from the switch, the static
>route of 2514A still shows in its (the 2514A) routing table, so it will
>still send packets destined to the 2.0 subnet through its e0 interface.

>My question is how do I configure the 2514 to aware that the static
>route is not valid when any of the NICs on the SUN server goes down.

>Alex Yeung,  CCNP, MCSE
>Network Engineer

--
Dr. Vincent C. Jones, PE              Expert advice and a helping hand
Computer Network Consultant           for those who want to manage and
Networking Unlimited, Inc.            control their networking destiny
14 Dogwood Lane, Tenafly, NJ
http://www.networkingunlimited.com

 
 
 

1. exchange routes between global IP routing table and VRF routing table

I understand that we can inject the global routes into the VRF routing
table using ip route vrf vrf_name x.x.x.x y.y.y.y next_hop global
command, and vice versa, however, my question is, is there any way to
do it dynamicly (like using dynamic routing protocol)? Since
currently, my customer VRF has a lot of public segment, e.g.
A.x.x.x/8, B.y.y.y/8. They need to access Internet over MPLS VPN link,
but I don't want to take care of every segment manually (using the
static routes with global switch commands).

If there is any way to do it dynamicly, please drop me a line, I
appreciate any input and help.

zher

2. Problem with fonts in EditView

3. How static routes come in & out of the routing table

4. Shutdown/Logoff via VB

5. What if route defined in Static Routing table is DOWN?

6. Problem with Cardinal 14.4 PLEASE HELP

7. Need help clearing static routing tables

8. JOB: Pensacola, FL Test Automation Specialist

9. OSPF routes not in routing table

10. Snapshot routing won't freeze RIP routing table

11. OSPF routes not reaching routing table

12. trimming static routing table ?