Hi I am trying to set up a basic lab on gns to have some hands on mpls VPN environment I created an ISP cloud running OSPF and mpls between all the P and PE routers. On the PE routers I created loop backs representing diff customers on different VRFs. I am running bgp on the PE routers and can see the other side route learned via BGP. When I say other side I mean the other end PE has exactly the same set up with loopbacks in the respective VRFs. So say on one PE I have VRF A with lo1 and ip 192.168.1.1/24 and the other end has lo1 in VRF A with ip 192.168.2.1/24.
Now when I do sh ip route VRF A on one PE, I do see the other route learnt via bgp.
Now the issue is for some reason I cannot ping the other end. I can ping my local ip only. I ran trace but it doesn't show any ip at all, all asterisks only.
I have a feeling I am missing something here.... I will send snapshot of the config very soon but I thought atleast I can put in the description of the issue.
Let me know if you have any suggestion in the meanwhile I get back with config details.
If mpls ip was missing on one device, LDP was not working there and the LSP was broken at that point.
The reason for this:
R5#sh bgp vpnv4 unicast all
Network Next Hop Metric LocPrf Weight Path
Route Distinguisher: 65000:1
*>i192.168.4.0 126.96.36.199 0 100 0 ?
Route Distinguisher: 65001:1 (default for vrf A)
*>i192.168.4.0 188.8.131.52 0 100 0 ?
*> 192.168.5.0 0.0.0.0 0 32768 ?
Is because you have two different VPNv4 routes. Remember that VPNv4 routes are the 32 bit IPv4 prefix + 64 bit Route Distinguisher, which makes the prefixes unique in the cloud. As you have applied a different RD in each PE, you see the VPNv4 route coming from the other PE with the RD 65000:1 and the same IPv4 prefix with the RD of the local PE 650001:1.
That makes sense. So what's the best practice in this kind of setup where I am simulating both sides of PEs sharing the same VRF are part of the same company? I have a feeling that the RD value should be the same for them. Thanks once again. Regards Mohit
It depends. Most common approach in SP is to assign the RD per PE, not per VPN. Simplest approach is to assign the RD per VPN. One of the advantages of using the RD per PE is that the same IPv4 prefix will be different (VPNv4) in the cloud and you could achieve load sharing as the RR will propagate both routes as in fact they are different. If you are using the same RD in the VPN, it will just advertise the best one. On the other hand, the memory consumption will be higher in the RD per PE case.
Question We run asr9001 with XR 6.1.3, and we have a very long delay to
login w/ SSH 1 or 2 to the device compare to IOS device. After
investigation, the there is 1s delay between the client KEXDH_INIT and
the server (XR) KEXDH_REPLY. After debug ssh serv...
Introduction The purpose of this document is to demonstrate the Open
Shortest Path First (OSPF) behavior when the V-bit (Virtual-link bit) is
present in a non-backbone area. The V-bit is signaled in Type-1 LSA only
if the router is the endpoint of one or ...
Hi, I am seeing quite a few issues with patch install and wanted to
share my experience and workaround to this. Login to admin via CLI, then
access root with the “shell” command Issue “df –h” and you’ll probably
see the following directory full or nearly ...