You can change Ethernet encapsulation if you're using VLANs, i.e. to ISL or 801.1q. You can also change encapsulation if you're using Novell NetWare, since Novell supports 4 different encpsulations.
But with IP, you can't change the encapsulation. IP is essentially always Ethernet II, although a router can use 802.2 with SNAP if it sees a recipient using it. But it's not configurable, at least not on the routers I've tried it on. If someone wants to show me that they did it, I will stop saying this. :-) You CAN, however change the encapsulation for ARP. Try this: Albany#config t Enter configuration commands, one per line. End with CNTL/Z. Albany(config)#int e0 Albany(config-if)#arp ? arpa Standard arp protocol frame-relay Enable ARP for a frame relay interface probe HP style arp protocol snap IEEE 802.3 style arp timeout Set ARP cache timeout Albany(config-if)#arp snap A Cisco router sends IP frames using the Ethernet Version II frame format, unless it receives IP frames in the SNAP format. If the router sees that a station is using SNAP frames for IP, the router sends SNAP frames. But, before the router can send an IP frame to a destination, it must find the MAC address using ARP. In order to reach a station configured for SNAP, the router must send the ARP using SNAP. I doubt this is the problem, because it's so unlikely someone would make this change. I wonder what the subnet mask on the other router is? That could cause a pinging problem (although I don't know if you would see an encapsulation failure, but you might. If the other router thinks it needs to route the packet but can't due to no routing you might see the encapsulation failure.) Anyway, the OBVIOUS answer is we need to see the configuration on both routers. We aren't mind-readers. :-) Priscilla M.C. van den Bovenkamp wrote: > > J B wrote: > > > Encapsulation by default is ARPA. > > Can this be changed? > > Yes, it can (try 'encap ?' in interface config mode), but you > don't need > to fiddle with that if you don't *know* you do. > > Regards, > > Marco. > > Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=66503&t=66472 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
