HA....Scott...haven't I seen you on TV....HA ! Thanks for the
input...and specific answers. You started to head, I think, in the
direction of suggesting how we might accomplish this. Again, all that I
am after is getting some type of notification of exactly when our
remote sights have "moved" to their backup connection (Nortel Contivity
Extranet switches). Essentially, our WAN is hub and spoke with the
primary connection being Frame-relay using Nortel ARN's at the remote
sights connected to the hub, a Nortel BLN, here at our corporate
office. The "hot" backup connection is a live Nortel Contivity
Extranet device at the remote sights connected into a central Nortel
Contivity Extranet device here at our corporate office using VPN. At the
remote sights, the primary device, the ARN, and the secondary device,
the Nortel Contivity Extranet device "talk" to
eachother using VRRP (similar to Cisco's HSRP) to notify one another
when the LAN interface on the ARN drops. When that
happens, the Nortel device's LAN interface then "assumes" the LAN
interface IP address of the ARN, communicates on his behalf, thus
changing the route to that remote network on our BLN here at the corporate
office. The BLN and the Nortel Extranet device here at the
corporate office are on either sides of a core Nortel Layer 3 switch. So
in the case of a remote sight failing over to it's backup connection into the
corporate office....that core Layer3's route and "next hop" to that remote
network will then change (OSPF) from the BLN to the Nortel Extranet
device. That change is what I need to detect.....either via traps to
NetView.......or from polling, which I'd rather not do, as the goal is know as
immediately as possible when that happens vs. waiting on the next poll.
I
apologize for the "problem" description vs. asking specific technical
questions about NetView, but I figured with as much knowledge and experience
with NetView as I see on this list, surely someone will know the direction I
should go to accomplish this.
Thanks for everyone's help and to all contributors
!!!!!
-----Original
Message-----
From: Barr, Scott
[mailto:Scott_Barr@csgsystems.com]
Sent: Wednesday, October 15, 2003
4:42 PM
To: nv-l@lists.us.ibm.com
Subject: RE: [nv-l] OSPF
route change detection
I
would not recommend even trying that unless you have a VERY small
network.
If
I understand OSPF correctly, what is going to happen is that when a route
change occurs, ALL routers in the OSPF area will reflect the route change.
This would mean that as soon as the first router changes, the rest will
begin to change and then basically you are duplicating your efforts across
many routers.
OSPF route changes happen for LOTS of reasons. For instance, if a
segment on the back of the router goes down, that triggers an ospf update.
When a circuit in a redundant environment fails, that can trigger ospf
updates, these happen all the time. Detecting route changes with NetView
could get ugly.
It's not really an OSPF mib either, it's the IP route table that gets
updated through either the OSPF process on the router or someone typing in a
static route. There is not that I know of, an OSPF mib you can query, only
the MIB-II IP mib. Here is a sample:
ip.ipRouteTable.ipRouteEntry.ipRouteNextHop.10.10.54.0 : IpAddress:
192.168.10.21
ip.ipRouteTable.ipRouteEntry.ipRouteNextHop.10.10.55.0 : IpAddress:
192.168.10.21
ip.ipRouteTable.ipRouteEntry.ipRouteNextHop.10.10.60.0 : IpAddress:
192.168.10.21
ip.ipRouteTable.ipRouteEntry.ipRouteNextHop.10.10.61.0 : IpAddress:
192.168.10.21
ip.ipRouteTable.ipRouteEntry.ipRouteNextHop.10.10.62.0 : IpAddress:
192.168.10.21
Whether it is OSPF or statically routed or EIGRP or RIP or whatever,
it is this table that gets updated and the only way I can think of to track
changes is to somehow store these routes locally and check them against the
next update when you query the router's IP route table again. Also note that
OSPF routing tables are significantly larger because they contain all known
routes in the OSPF area. Proceed with caution here. Other comments welcomed
since I am not a routing protocol guru, I just play one on
TV.
Does anybody
have a suggestion on what OID to query within an OSPF configured router to
determine/notify when a route changes. I am quite new to
understanding the MIB world and Netview for that matter and have the task
of setting up a notification system (using Netview as either a "poll"er or
trap receiver, along with TEC) to notify our WAN dept. when routes
change. Any ideas ?
Thanks in
advance !!!
Brian Kraftchick
Network Administrator
Old Dominion Freight
Line
Ph: (336) 822-5938
Fax: (336) 822-5149