482
3. Enter interface view.
interface
interface-type
interface-number
N/A
4. Enable BFD echo packet
mode for IPv6 IS-IS FRR.
isis ipv6 primary-path-detect bfd
echo
By default, BFD echo packet
mode for IPv6 IS-IS FRR is
disabled.
Enabling IPv6 IS-IS MTR
On a network, IPv4 and IPv6 topologies must be consistent so that both IPv6 IS-IS and IPv4 IS-IS
can use the SPF algorithm to perform route calculation. If they are different, routers supporting both
IPv4 and IPv6 might send IPv6 packets to routers that do not support IPv6, resulting in packet loss.
To resolve this issue, configure IPv6 IS-IS Multi-Topology Routing (MTR) to perform route calculation
separately in IPv4 and IPv6 topologies.
Figure 111 Network diagram
As shown in Figure 111, the numbers refer to the link costs. Router A, Router B, and Router D
support both IPv4 and IPv6. Router C supports only IPv4 and cannot forward IPv6 packets.
Enable IPv6 IS-IS MTR on Router A, Router B, Router C, and Router D to make them perform route
calculation separately in IPv4 and IPv6 topologies. With this configuration, Router A does not forward
IPv6 packets destined to Router D through Router B, avoiding packet loss.
Configuration prerequisites
Before you configure IPv6 IS-IS MTR, configure basic IPv4 and IPv6 IS-IS functions, and establish
IS-IS neighbors.
Configuration procedure
To enable IPv6 IS-IS MTR:
1. Enter system view.
system-view
N/A
2. Enter IS-IS view.
isis
[ process-id ] [
vpn-instance
vpn-instance-name ]
N/A
3. Specify an IS-IS cost style.
cost-style
{
wide
|
wide-compatible
|
compatible
}
By default, the IS-IS cost style is
narrow
.
4. Enter IPv6 address family
view.
address-family ipv6
[
unicast
]
N/A
Router A
Router B
Router D
Router C
IPv
4
IPv
4
36
5
4
3
IPv6
IPv6
IPv4
IPv4
IPv6IPv
6
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