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•
autodetect interface interface-id — The VLAN routing interface on which
the neighbor's link local IPv6 address is auto detected. Use the vlan
keyword and a VLAN ID. Range 1-4093.
•
hop-count — The maximum hop-count allowed to reach the neighbor.
The allowed range is 1–255.
Default Configuration
The default hop count is 64.
Command Mode
BGP Router Configuration mode, IPv6 Address Family Configuration mode
User Guidelines
The ebgp-multihop parameter is relevant only for external BGP neighbors.
For internal BGP neighbors, the TTL value remains 64 and can't be modified.
A neighbor can inherit this configuration from a peer template. To make the
update-source config work for external BGP neighbors, ebgp-multihop hop-
count should be configured to a TTL value larger than the default TTL of 1.
Autodetect Interface
When BGP is deployed in an IPv6 data center network, it is desirable to use
IPv6 link local addresses as BGP neighbors. Using link local addresses avoids
the need to assign and manage global IPv6 addresses on interconnect links.
Dell EMC Networking already supports BGP neighbors with link local IPv6
addresses, but it requires that the link local IPv6 address of the neighbor be
configured using the BGP "neighbor" command. Since the link local address
is derived from the switch MAC address, the network administrator needs to
know the MAC address of all the switches deployed in the network, and if one
switch fails and is replaced with a different switch then all the BGP neighbor
switches need to be reconfigured to change the link local address specified in
their neighbor commands.
The IPv6 Link Local Address Auto Detect feature eliminates the need for the
network administrator to configure the link local IPv6 address of every
neighbor. Instead of specifying the link local IPv6 address, the network
Layer 3 Routing Commands
1273
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