The problem is that the central router is bring up the ISDN line throughout the night to establish a DLSw+ peer with the client router although there is no traffic to send.
What could be causing this ???
My understanding, based on the details given on CCO, is that the DYNAMIC keyword prevents the peer connection from being brought up automatically only when a circuit tries to connect, DDR dialing is initiated and the peer comes up.
Does this mean that we have a device on our central network that tries to establish a circuit with a device on the client network throughout the night?
What would be the best method for troubleshooting this problem?
I do not have enough information to tell you the root cause. I am guessing that the central router receives LLC1 traffic. Thus, it brings up the DLSw peer connection. If you only want to transpot SNA traffic over DLSw, you can define "dlsw icanreach sap 4" on the client router. If that does not fix the problem, please take a sniffer trace to capture the DLSw traffic (i.e. any ip path between the central router and client router)
As a further test, I have setup a Cisco 2600 router on ISDN and set the config the same as a client router. I have assigned the client test router an IP range that is free but also has a DLSw+ peer setup on the central router.
To prove that the central router is bringing the ISDN line up to establish the DLSw+ peer to the client test router, I have setup a private Dialer interface on our central router just for this client test router and then assigned an outbound access list to the interface.
The access list is set to block any netbios traffic as well as blocking DLSw+ traffic on port 2065 and allowing any other traffic to get to the central site if it needs to. The results of the access list are shown below and I can clearly see that the DLSw+ peer port 2065 is trying to communicate with the site. (No DLSw+ peer config is on the client test router, so the central router is forcing communication).
deny udp any eq netbios-dgm any
deny udp any eq netbios-ns any
deny udp any eq netbios-ss any
deny tcp any any eq 139
deny tcp any any eq 445
deny tcp any eq 2065 any (90 matches)
permit ip any any
If I remove the IP route for the client test router from the central router, then the central router will sit there and will not bring up the ISDN line at all.
What could be causing the central router to bring up the ISDN line to establish the DLSw+ peer to the client router, although the client router has no DLSw+ config???
Topology & Design:
Two ACI fabrics
Stretching VLANs using OTV
Both fabrics are advertising BD subnets into same routing domain
Some BDs(or say VLANs) are stretched, but some are not.
Endpoints can move betwee...
VMware Trunk Port Group is supported from ACI version 2.1
VMM integration must be configured properly
ASA device package must be uploaded to APIC
ASAv version must be compatible with ACI and device package version
Topology &Design:Traffic flow within same fabric:Endpoint moves to Fabric-2Bounce Entry Times OutTraffic Black-holedSummarySolutionAppendix:
In the Previous articles of ACI Automation, we are using Postman/Newman a...