Huawei Quidway NetEngine80E Configuration Manual page 145

HUAWEI NetEngine80E/40E Router
Configuration Guide - IP Routing
Configuring the association between the IPv6 direct route and PW
downstream traffic loss during the traffic switchback after the primary pseudo wire (PW)
recovers.
However, on the network shown in
multiple base stations. These base stations usually use logical IP addresses to communicate with
access aggregation gateways (AGGs), so IPv6 direct routes between base stations and AGGs
cannot be used to forward packets. In addition, AGGs do not have routes to the logical IP
addresses of the base stations. To address this problem, you must configure IPv6 static routes
on AGGs to forward downstream traffic. As network administrators usually configure
consecutive logical IP addresses for base stations based on IP address planning, you must
configure IPv6 static routes to specific base stations on AGGs. As shown in
CSG-AGG1 link that bears the primary PW recovers, AGG1 immediately advertises its IPv6
static routes to radio network controller site gateways (RSGs). RSGs then select these routes
and downstream traffic is switched over to LinkA. However, AGG1 has not learned the MAC
addresses of the base stations yet and the primary PW is unavailable, so packets are dropped
during the traffic switchback.
Figure 2-2 Networking of configuring IPv6 static routes to inherit costs of iterated routes
Loopback0
1::1/128
Loopback0
1::2/128
Loopback0
1::3/128
To solve this problem, you can configure IPv6 static routes to inherit costs of iterated routes.
Because IPv6 static routes are iterated to IPv6 direct routes and costs of IPv6 direct routes are
determined by PW status, this configuration implements the association between IPv6 static
routes and PW status. On the network shown in
on AGG1 to inherit costs of iterated routes. When the link that bears PW1 recovers:
l
Issue 02 (2014-09-30)
NodeB
NodeB
NodeB
If PW1 is still standby, the IPv6 direct route between AGG1 and CSG has a high cost.
Because the IPv6 static routes on AGG1 inherit the direct route cost, the IPv6 static routes
also have high costs. In this case, even if AGG1 advertises IPv6 static routes to RSGs,
RSGs do not preferentially select these routes and downstream traffic still travels along
LinkB.
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Figure 2-2, the cell site gateway (CSG) is connected to
AGG1
CSG
PW1
PW2
AGG2
L2VPN
PW
Figure 2-2, you can configure IPv6 statics routes
2 IP Static Route Configuration
status. This will reduce
Figure 2-2, if the
RSG1
Link A
Link B
RSG2
BGP/MPLS IPv6 VPN
RNC
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