Node Interfaces on Active J Series Chassis Clusters

Normally, on J Series devices, the built-in interfaces are numbered as follows:

ge-0/0/0

ge-0/0/1

ge-0/0/2

ge-0/0/3

. . .

Caution: Layer 2 switching must not be enabled on J Series device when chassis clustering is enabled. If you have enabled Layer 2 switching, make sure you disable it before enabling chassis clustering.

After you enable chassis clustering and reboot the system, the built-in interface named ge-0/0/2 is repurposed as the management interface and is automatically renamed fxp0. Likewise, the built-in interface named ge-0/0/3 is repurposed as the control interface and is automatically renamed fxp1.

After the devices are connected as a cluster, the slot numbering and thus the interface numbering will change for one device. The cluster determines the slot number for each slot in both nodes using the following formula:

cluster slot number = (node ID * maximum slots per node) + local slot number

In chassis cluster mode, the interfaces on the secondary node are renumbered internally. For example, the management interface port on the front panel of each J2320 device is still labeled ge-0/0/2, but internally, the node 1 port is referred to as ge-4/0/2.

Table 79 shows the slot numbering, as well as the port and interface numbering, for both of the J Series devices that become node 0 and node 1 of the cluster after the cluster is formed.

Table 79: J Series Chassis Cluster Slot Numbering and Port/Interface Naming

Model	Chassis	Maximum Slots Per Node	Slot Numbering in a Cluster	Management Physical Port/Logical Interface	Control Physical Port/Logical Interface	Fabric Physical Port/Logical Interface
J2320	Node 0	4 (PIM slots); includes one pre-set slot	0 — 3	ge-0/0/2	ge-0/0/3	Any Gigabit Ethernet port
	Node 0		0 — 3	fxp0	fxp1	fab0
	Node 1		4 — 7	ge-4/0/2	ge-4/0/3	Any Gigabit Ethernet port
	Node 1		4 — 7	fxp0	fxp1	fab1
J2350	Node 0	6 (PIM slots); includes one pre-set slot	0 — 5	ge-0/0/2	ge-0/0/3	Any Gigabit Ethernet port
	Node 0		0 — 5	fxp0	fxp1	fab0
	Node 1		6 — 11	ge-6/0/2	ge-6/0/3	Any Gigabit Ethernet port
	Node 1		6 — 11	fxp0	fxp1	fab1
J4350 and J6350	Node 0	7 (PIM slots); includes one pre-set slot	0 — 6	ge-0/0/2	ge-0/0/3	Any Gigabit Ethernet port
	Node 0		0 — 6	fxp0	fxp1	fab0
	Node 1		7 — 13	ge-7/0/2	ge-7/0/3	Any Gigabit Ethernet port
	Node 1		7 — 13	fxp0	fxp1	fab1

Information about cluster slot numbering is also provided in Figure 93.

Note: See the J Series Services Routers Hardware Guide for details about J Series devices. The JUNOS Software Interfaces Configuration Guide for Security Devices provides a full discussion of the interface naming convention.

After you enable chassis clustering, the two chassis joined together cease to exist as individuals and now represent a single system. As a single system, the cluster now has twice as many PIM slots. (See Figure 93.)

Figure 93: PIM Slot Numbering in a J Series Chassis Cluster (J6350 Devices)

Image g030605.gif

Node Interfaces on Active J Series Chassis Clusters

Related Topics