Reenabling the Ports, Type Description | Cisco Systems Cisco IOS XR

Chapter 3 Bringing Up the Cisco IOS XR Software on a Multishelf System

Integrated Switch System

Table 3-6lists the ROMMON switch configuration.

Table 3-6 ROMMON Switch Configuration

Type	Description

Switch connections	The BCM5618s create the intra-rack control network. The BCM5690s
	create the inter-rack control network. There are two BCM5690 switches
	that are connected through a 10 Gbps stacking link. Port 11 on
	BCM5690-sw1 is connected to BCM5618-sw0-GE, which is also referred
	to as BCM5618-GE0. This is the link that connects the intra-rack control
	network to the inter-rack control network. Port 0 on BCM5618-sw0 is
	connected to the control Ethernet port for the CPU.

Port configuration	Both BCM5690 switches are configured to forward traffic only to port 11
	of BCM5690-sw1 (for example, the CPU bound port). Because forwarding
	is not enabled between any other ports on those switches, the switches can
	never participate in a loop. The BCM5618s are configured in a very similar
	manner by enabling forwarding to only port 0 (CPU port) of BCM5618-sw0
	to or from any other port.

Implementing the Integrated Switch in Cisco IOS XR

When the RP and SCGE node boots to Cisco IOS XR software, rapid spanning tree protocol (RSTP) starts to run on that node. On the RP, the RSTP configures the state of the 2-GE and inter-RP (backplane) FE port. RSTP runs on all ports of inter-rack switches in addition to the intra-rack switch ports.

Assigning a Bridge Priority

The switches on the 22-port SCGE, which are connected to each other, form the core of the network. The RP connections form the edge (regardless of whether the 22-port SCGEs are connected in a full or partial mesh). In steady state, the integrated switch network has the root in the core. The root is one of the

22-port SCGEs.The following default priorities are achieved with the RSTP software:

•RP is set to 36864.

•22-port SCGE is set to 32768.

Booting Up the Integrated Switch Network

The bootup behavior of the integrated switch network is slightly different when compared with the Catalyst 6509-based network. For the 22-port SCGEs, the switching control fabric of the control Ethernet is brought up at the same time as the Cisco CRS-1 system. Whereas, the Catalyst 6509-based multichassis control network system is assumed to be up and running before the Cisco CRS-1 boots up. Initially, the designed system controller (DSC) comes up first, followed by the FCCs and line card chassis (LCCs).