eBGP mulithop is used when peering with another BGP speaking router that is more than one hop away. By default, eBGP peering messages are link local, so the TTL value in the packet is 1. The eBGP Multihop command is used to change the default TTL value to something other than one.
from: Cisco IOS IP Routing: BGP Command Reference
neighbor ebgp-multihop
To accept and attempt BGP connections to external peers residing on networks that are not directly connected, use the neighbor ebgp-multihopcommand in router configuration mode. To return to the default, use the no form of this command.
neighbor {ip-address | ipv6-address | peer-group-name} ebgp-multihop [ttl]
no neighbor {ip-address | ipv6-address | peer-group-name} ebgp-multihop
Syntax Description
ip-address
|
IP address of the BGP-speaking neighbor.
|
ipv6-address
|
IPv6 address of the BGP-speaking neighbor.
|
peer-group-name
|
Name of a BGP peer group.
|
ttl
|
(Optional) Time-to-live in the range from 1 to 255 hops.
|
Files:
Topology
R1
R2
R3
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