01-27-2007 05:18 AM - edited 03-03-2019 03:31 PM
can anybody tell me how many static routes can be configured on a a Cisco router between a source and a destination?
01-27-2007 06:13 AM
The limit would be determined by the amount of RAM you have to build the routing table.
Larger routers --> more RAM --> more routes
There are other practical considerations (like CPU and other configured features, like ACLs and NATs), but the real limit is RAM.
What have you got, and how many routes are you trying to configure?
Good Luck
Scott
01-27-2007 06:29 AM
George,
I dont know the exact amount, but i tried it in my lab by connecting 8 links between the routers and all the 8 routes were entered intthe routing table.
below is the route table
R1#sh ip route
Gateway of last resort is not set
17.0.0.0/24 is subnetted, 1 subnets
S 17.16.100.0 [1/0] via 8.8.8.2
[1/0] via 7.7.7.2
[1/0] via 6.6.6.2
[1/0] via 5.5.5.2
[1/0] via 4.4.4.2
[1/0] via 3.3.3.2
[1/0] via 2.2.2.2
[1/0] via 1.1.1.2
1.0.0.0/24 is subnetted, 1 subnets
C 1.1.1.0 is directly connected, Serial1/0
2.0.0.0/24 is subnetted, 1 subnets
C 2.2.2.0 is directly connected, Serial1/1
3.0.0.0/24 is subnetted, 1 subnets
C 3.3.3.0 is directly connected, Serial1/2
4.0.0.0/24 is subnetted, 1 subnets
C 4.4.4.0 is directly connected, Serial1/3
5.0.0.0/24 is subnetted, 1 subnets
C 5.5.5.0 is directly connected, Serial2/0
6.0.0.0/24 is subnetted, 1 subnets
C 6.6.6.0 is directly connected, Serial2/1
7.0.0.0/24 is subnetted, 1 subnets
C 7.7.7.0 is directly connected, Serial2/2
8.0.0.0/24 is subnetted, 1 subnets
C 8.8.8.0 is directly connected, Serial2/3
In case of routing protocols the MAx amount mostly is 6.
But when you have more than 6 links, you can multilink a pair of 6 links into one and go upto 36 links logically.
The multilink concept can be applied to static routes too
But in the end it all depends upon the processing power your router has got.
HTH, rate if it does
Narayan
01-27-2007 06:44 AM
But how do you directly connect the IP to the serial interface?
01-27-2007 09:34 AM
Can you please elaborate on your question
Narayan
01-27-2007 10:13 AM
There are two forms of the command to create a static route:
IP ROUTE a.b.c.d m.m.m.m ga.gb.gc.gd
IP ROUTE a.b.c.d m.m.m.m interface
In the first instance, you provide the net/subnet (and mask) of the target network (a.b.c.d m.m.m.m) the next hop address (ga.gb.gc.gd) and an optional metric (for cases when you want a "floating static" to cover a path in case the primary link drops, for example).
The router determines the interface automatically, based on the interface's address ... the "next hop" would be in the same net/subnet as the router's egress interface.
In the second instance, you explicitely tell the router to send all traffic for the target net/subnet out a particular interface (and an optional metric, for the same reasons as the first instance).
The router doesn't know or care what's on the other side ... you have directed it to pump all the traffic for a.b.c.d with a mask of m.m.m.m to the specified interface ... .whether it's valid or not, that's where the traffic will go.
The advantage of one over the other relates to how the routing table reacts when the path becomes invalid, I believe.
Good Luck
Scott
01-27-2007 06:32 PM
Narayan, You have understood the Qn correctly. I hope the number of ststic routes for a destination can go beyond 8 also and the router will load share among these links.
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