Dynamic ECMP
The dynamic ECMP (equal-cost multi-path) for IGP (Interior Gateway Protocol) prefixes feature supports
dynamic selection of ECMP paths ranging from 1 to 64 IGP paths. ECMP for non-recursive prefixes is
dynamic. ASR 9000 Enhanced Ethernet Line Card supports 64 ECMP paths for IGP prefixes.
This feature enables loadbalancing support in hardware among egress links.
8-32 ECMP paths are available for BGP recursive prefixes. The ASR 9000 Enhanced Ethernet Line Card
supports 32 ECMP paths for BGP prefixes and the ASR 9000 Ethernet Line Card supports 8 ECMP paths
for BGP prefixes.
Note
How to Implement Static Routes
This section contains the following procedures:
Configure Static Route
Static routes are entirely user configurable and can point to a next-hop interface, next-hop IP address, or both.
In the software, if an interface was specified, then the static route is installed in the Routing Information Base
(RIB) if the interface is reachable. If an interface was not specified, the route is installed if the next-hop address
is reachable. The only exception to this configuration is when a static route is configured with the permanent
attribute, in which case it is installed in RIB regardless of reachability.
Currently, only default VRF is supported. VPNv4, VPNv6 and VPN routing and forwarding (VRF) address
families will be supported in a future release.
Note
This task explains how to configure a static route.
SUMMARY STEPS
1.
configure
2.
router static
3.
vrf vrf-name
4.
address-family { ipv4 | ipv6 } { unicast | multicast }
5.
prefix mask [vrf vrf-name ] { ip-address | interface-type interface-instance } [ distance ] [ description
text ] [ tag tag ] [ permanent ]
6.
commit
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.3.x
635
Implementing Static Routes
Dynamic ECMP
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