Figure 2-1
Networking of configuring static routes to inherit costs of iterated routes
AGG2
RSG2
AGG1
RSG1
RNC
CSG
L2VPN
L3VPN
Link A
Link B
PW1
PW2
PW
NodeB
NodeB
NodeB
Loopback0
1.1.1.1/32
Loopback0
1.1.1.2/32
Loopback0
1.1.1.3/32
To solve this problem, you can configure static routes to inherit costs of iterated routes. Because
static routes are iterated to direct routes and costs of direct routes are determined by PW status,
this configuration implements the association between static routes and PW status. On the
network shown in
, you can configure statics routes on AGG1 to inherit costs of
iterated routes. When the link that bears PW1 recovers:
l
If PW1 is still standby, the direct route between AGG1 and CSG has a high cost. Because
the static routes on AGG1 inherit the direct route cost, the static routes also have high costs.
In this case, even if AGG1 advertises static routes to RSGs, RSGs do not preferentially
select these routes and downstream traffic still travels along Link B.
l
If PW1 becomes active, the direct route between AGG1 and the CSG has the default cost
0. Because the static routes on AGG1 inherit the direct route cost, the static routes also have
the cost value 0. In this case, after AGG1 advertises static routes to RSGs, RSGs select
these routes and downstream traffic is switched over to Link A. At this time, AGG1 has
learned the MAC addresses of the base stations, and downstream traffic loss will be reduced.
Pre-configuration Tasks
Before configuring IPv4 static routes to inherit costs of iterated routes, complete the following
task:
l
Configuring link-layer protocol parameters and IP addresses for interfaces to ensure that
the link layer protocol of each interface is Up
Procedure
Step 1
Run:
system-view
The system view is displayed.
HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
2 IP Static Route Configuration
Issue 02 (2014-09-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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