I'm trying to ping R4 from R1(and vice versa) but I am completely stuck and clueless what to do next. R2---EBGP---R4 R3---EBGP---R4 R1 and R5 is acting like a Core from a LAN network using loopback. I can ping R1 from R5 and vice versa. Can anyone h...

sorted

I have configured a 3 tier network using VLAN, STP, Etherchannel, HSRP and would add OSPF on core layer. But after having a connection test around Distribution to Access layer, the pings from some PCs are loss. Sometimes it can ping different a certa...