06-05-2008 10:20 AM - edited 03-03-2019 10:15 PM
If I change the bandwidth statement on an interface (serial subinterface), do I have to bounce the interface/subinterface for eigrp to start using the new value for route calculations?
Thanks
Solved! Go to Solution.
06-05-2008 12:34 PM
You need to change the bandwidth on the interface running EIGRP.
If the subinterface had an BVI associated to it, it means the subinterface represented the Layer2 connection while the BVI represented the Layer3 instance. EIGRP runs on interfaces with Layer3 (IP) information.
HTH,
__
Edison.
06-05-2008 11:08 AM
No, you don't.
__
Edison.
06-05-2008 11:26 AM
Then I guess I have something else going on here. I removed the bandwidth statement from the interface. A "show interface" shows the new bandwidth (the default), but if you look at the "show ip eigrp topo" for routes, these reflect the old bandwidth (BW) statement.
06-05-2008 11:39 AM
Hmm, let me pull up my lab...
Rack1R2#sh ip eigrp topology 192.168.1.1 255.255.255.255
IP-EIGRP (AS 1): Topology entry for 192.168.1.1/32
State is Passive, Query origin flag is 1, 1 Successor(s), FD is 2297856
Routing Descriptor Blocks:
192.168.12.1 (Serial1/0.1), from 192.168.12.1, Send flag is 0x0
Composite metric is (2297856/128256), Route is Internal
Vector metric:
Minimum bandwidth is 1544 Kbit
Total delay is 25000 microseconds
Reliability is 255/255
Load is 1/255
Minimum MTU is 1500
Hop count is 1
__________
Rack1R2(config)#int s1/0.1
Rack1R2(config-subif)#band
Rack1R2(config-subif)#bandwidth 20000
Rack1R2(config-subif)#end
___________
Rack1R2#sh ip eigrp topology 192.168.1.1 255.255.255.255
IP-EIGRP (AS 1): Topology entry for 192.168.1.1/32
State is Passive, Query origin flag is 1, 1 Successor(s), FD is 768000
Routing Descriptor Blocks:
192.168.12.1 (Serial1/0.1), from 192.168.12.1, Send flag is 0x0
Composite metric is (768000/128256), Route is Internal
Vector metric:
Minimum bandwidth is 20000 Kbit
Total delay is 25000 microseconds
Reliability is 255/255
Load is 1/255
Minimum MTU is 1500
Hop count is 1
06-05-2008 12:25 PM
My subinterface has a bvi associated with it. No bandwidth was coded for this bvi so it must have initially used the bandwidth from the subinterface associated with it. When I changed the bandwidth on the subinterface it did not update the bvi bandwidth and eigrp did not get updated (does eigrp use the bvi for its calculation?). Changed the bandwidth on the bvi to reflect the change to the subinterface and eigrp is now doing what I wanted it to do.
I was not doubting you, when you said you did not need to bounce the interface, I was just trying to figure out how my situation was different. It would appear the bvi was the answer. Thanks
06-05-2008 12:34 PM
You need to change the bandwidth on the interface running EIGRP.
If the subinterface had an BVI associated to it, it means the subinterface represented the Layer2 connection while the BVI represented the Layer3 instance. EIGRP runs on interfaces with Layer3 (IP) information.
HTH,
__
Edison.
06-06-2008 05:55 AM
Thanks again. On a side note about the BVI, if I am going to employ QOS over this link using and trusting dscp markings, would I then activate it on the bvi and not the serial interface or do I have to use COS and the layer 2 serial interface.
06-06-2008 06:12 AM
Your scenerio is similar to a switch configuration.
Where do you usually place the QoS in a switch, on a SVI (Switch Virtual Interface) or on the L2 switchport?
The answer is the L2 switchport :)
06-06-2008 06:29 AM
Well we have not deployed QOS yet and the connections between switches in our networks are layer 3 routed ports which are fairly straight forward.
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide