Equal Cost Multipath Routing - Allied Telesis SwitchBlade x908 Series Software Reference Manual

The following table lists the default administrative distances of protocols.
Protocols
Connected
Routes directly connected to an interface.
Static
Routes added using the ip route command or
learnt through DHCP options on interfaces using
DHCP to obtain an IP address.
eBGP
Routes learnt from BGP that are external to your
network.
OSPF
Routes learnt from OSPF.
RIP
Routers learnt from RIP.
iBGP
Routes learnt from BGP that are internal to your
network.
You can change the administrative distances for static routes and protocol derived routes. Use
the following commands:
■
■
awplus(config-router)#
awplus(config-router)#
■
awplus(config-router)#
awplus(config-router)#
■
awplus(config-router)#
You cannot set an administrative distance for connected routes.

Equal Cost Multipath Routing

When multiple routes are available for the same prefix within the FIB, then your device uses
Equal Cost Multipath Routing (ECMP) to determine how to forward packets.
C613-50007-01 REV B
for static routes, specify the distance when adding the route. Use the command:
awplus(config)#
for eBGP and iBGP routes, enter the router mode, and use the command:
to enter a separate administrative distance value for each BGP route type. To set the
administrative distance for a specific BGP route, use the command:
for OSPF routes, enter the router mode, and use the command:
to enter a separate administrative distance value for each OSPF route type. To set the
same value for all OSPF route types, use the command:
for RIP routes, enter the router mode, and use the command:
This sets the administrative distance for all RIP routes.
Software Reference for SwitchBlade® x908, x900 and x600 Series Switches
TM
AlliedWare Plus Operating System - Software Version 5.3.1
Distance
-
1
20
110
120
200
ip route <subnet&mask> {<gateway-ip>|<ifname>} [<1-255>]
distance bgp <ebgp> <ibgp> <local>
distance <1-255> <ip-address/m> [<listname>]
distance ospf {external <1-255>|inter-area <1-255>|
intra-area <1-255>}
distance <1-255>
distance <1-255> {<ip-address/m> [<access-list>]}
Route Selection
Preference
1 (highest)
2
3
4
5
6 (lowest)
29.5