![loopback ping loopback ping](https://i.stack.imgur.com/cdwex.jpg)
Because the cpcar of the packet type of ICMP is larger than mpls-fib-hit. (4) Why the last packet always dropped when the customer ping the loopback IP address.
#Loopback ping how to
The priority of mpls-fib-hit is higher than ICMP, so the packets with the mpls head are matched the packet type of mpls-fib-hit. Ping Command - How to test Network Adapter - posted in Internal Hardware: Ive been reading about the Ping command and there seems to be conflicting information about the loopback test, using the. (3) The packet will include the mpls head when you ping the loopback address, but the packet won’t include the mpls head when you ping the interface address. Because the switch only distributes mpls label to the IP host routes with 32-bit addresses by default, and won’t distributes mpls label to the direct route. (2) Why the customer ping different IP address, the ICMP packets matched different packet type. (2)the cpu-defend statistic when ping the interface IP address:
![loopback ping loopback ping](https://ars.els-cdn.com/content/image/3-s2.0-B9780128027325000012-u01-18-9780128027325.jpg)
(1)the cpu-defend statistic when ping the loopback IP address: However, when the customer ping the interface address it matched the packet type of ICMP, and there are no drop statistics on the packet type of ICMP. Make sure the untrust interface can ping the loopback. (1) We checked the cpu-defend statistic and found that when the customer ping the loopback address it matched the packet type of mpls-fib-hit, and there are drop statistics on the packet type of mpls-fib-hit. Youll need to create a second loopback interface in addition to the first loopback interface used for the Portal.
#Loopback ping software
The software version of S6700EI is V200R005. PING 100.0.0.2: 7000 data bytes, press CTRL_C to break PING 1.1.1.1: 7000 data bytes, press CTRL_C to break However the customer tried to ping the interface IP address with packet’s size 7000byte, it is always successful and no drop statistic under mpls-fib-hit. And at the same time there is cpu-defend drop statistic under mpls-fib-hit. If the customer tried to ping the loopback IP address with packet’s size 7000byte, the last packet always dropped. Input-list Ĭlearly I have misunderstood something here.S6700EI is PE or P of the IP/MPLS backbone network. The configuration of my loopback interface is fairly straightforward: + = Active Route, - = Last Active, * = Both
![loopback ping loopback ping](https://www.omnisecu.com/images/tcpip/ping-127.255.255.255.jpg)
Router-peering.inet.0: 10668 destinations, 10674 routes (10668 active, 0 holddown, 0 hidden) Here's part of the vr-send-to-peering-provider policy that imports routes which exposes (among other things) the loopback interface to the router-peering instance. Instance-import vr-send-to-peering-provider Peering or Transit) are received by the loopback, but return the ping as from an address associated with the physical interface (either the IRB or Physical interface - whichever is the egress for the return packet).įor the routing instance peering, I have the following (abbreviated):
![loopback ping loopback ping](https://i.ytimg.com/vi/1x6hy_z84M0/maxresdefault.jpg)
Pings that come via one of the other routing tables (i.e. Routers/Switches that are within the Master Routing instance can ping 123.0.0.1/32 and get 123.0.0.1/32 as the source of the return packets.Ģ. You'll get reply from the earlier said device and at that time it will not work as loopback device. Consider pinging the same IP from another device. But here it is the same device, thus acts as a loopback device. Let's say the loopback is on 123.0.0.1/32 (not its actual address).ġ. So, when you access/ping 192.168.1.15, the request goes to the device with that IPv4. Additional Tables for Peering, Transit and additional ones for special cases where I need to get subsets of either Transit or Peering to other customers.Īll of this works very well, however I'm experiencing something I can't explain with a loopback interface I have configured. The default Master Routing table is used for Interior Routing.Ģ. I am currently working with a pair of MX80s on 11.2r7.4 and am using multiple Routing Instances for the first time.ġ.