FD 100/320Gbps NT and FX NT IHub Services Guide Services Overview
Issue: 13 3HH-11985-AAAA-TQZZA 75
•
oper state
• type (GRE-only)
3.14.4 Statistics Collection
GRE tunnel statistics are enabled or disabled dynamically using CLI commands. The
statistics counter includes the number of Rx packets, Rx bytes, Tx packets, and Tx
bytes.
A maximum of 90 GRE tunnels can be enabled to collect statistics simultaneously.
3.14.5 OAM Interactions
Ingress or egress traffic for an IES service associated with GRE tunnels can be
mirrored like other traffic. The ability to ping the remote end private interface IP is also
supported. ISAM can respond to the ping, traceroute over GRE encapsulation.
3.15 DHCP6 Relay Prefix Stability
DHCP6 Prefix Stability allows ISAM to maintain the IPv6 Prefixes Delegated to a
device, when the device is moved from one ISAM to another ISAM. When device
movement happens, it is identified as follows:
• Offline Notification
When a device is brought down, an offline notification is sent to ISAM and a hold
down timer is initiated. When the device comes back online before the hold down
timer expires, the route table will be unaffected. If the timer expires, then route
cleanup will occur. DHCP6 lease states and MAC table entry will also be cleared.
• Route received by means of IGP
For a DHCPv6 PD route entry, an IGP route can be received. In such scenarios,
a ND reachability check is initiated and if the managed route entry's next hop is
reachable, then a Duplicate PD Alarm is raised to inform the administrator about
an invalid DHCP6 PD delegation. The alarm will be cleared when the invalid route
is removed.
Duplicate PD Alarm will be generated when:
• An IGP route is received for an existing DHCPv6 PD route entry which has a
reachable next hop
• A DHCPv6 PD route is received for an existing IGP route
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