|
Feature |
Product |
Release introduced |
|---|---|---|
|
Egress Shaper for Fabric Extend tunnels on Fabric IPsec Gateway virtual machine |
5320 Series |
Not Supported |
|
5420 Series |
Not Supported |
|
|
5520 Series |
Not Supported |
|
|
5720 Series |
Fabric Engine 8.7 Supported on 5720-24MXW and 5720-48MXW |
|
|
7520 Series |
Fabric Engine 8.10 |
|
|
7720 Series |
Fabric Engine 8.10 |
|
|
VSP 4900 Series |
VOSS 8.3.1 Supported on VSP4900-12MXU-12XE and VSP4900-24XE |
|
|
VSP 7400 Series |
VOSS 8.3.1 |
You can configure the egress shaping rate to limit egress bandwidth for tunnels on the Fabric IPsec Gateway Virtual Machine (VM).
Egress Tunnel Shaping shapes unicast, multicast, and unknown unicast egress traffic on the tunnel.
Eight traffic queues are created for the tunnel traffic when a new shaper is configured. Packets are mapped to any of these queues based on the internal Class of Service (CoS) of the packets. When multiple tunnels use the common shaper value, an internally unique shaper is associated for each tunnel. The following table shows the default minimum weight for each queue.
| Queue | Default minimum weight |
|---|---|
|
0 |
5 |
|
1 |
20 |
|
2 |
30 |
|
3 |
40 |
|
4 |
50 |
|
5 |
50 |
|
6 |
Rate limited to 50% of configured shaper rate |
|
7 |
Rate limited to 5% of configured shaper rate |
Queues 6 and 7 are rate limited and have a higher priority. The maximum traffic allowed out of queue 6 and queue 7 would be shape rate/2 (50% bandwidth) and shape rate/20 (5% bandwidth).
Consider the following when you configure the egress shaper rate:
If the ingress data traffic receives excessive packets with the following DiffServ Code Point (DSCP) or 802.1p values (high priority control packets) and egress shaping is configured, a IS-IS flap can be seen.
| DSCP value | 802.1p value |
|---|---|
|
0x28 |
6 |
|
0x2E |
6 |
|
0x2F |
6 |
|
0x30 |
7 |
|
0x38 |
7 |
The egress tunnel shaping rate is impacted if the incoming packet size is greater than the Fabric Extend tunnel MTU. This is due to the additional packet header required for fragmentation.