Root Guard If a switch with a lower bridge ID enters the network, it can preempt the current STP root. Root guard can be enabled on an interface to prevent it from…
Tag: BCMSN Notes
CCNP BCMSN Notes – Spanning Tree Configuration
Root Bridge Configuration The root bridge should be positioned centrally in the network to ensure the spanning tree forms in a predictable manner. Two bridge ID formats are available: 802.1D Standard…
CCNP BCMSN Notes – Traditional Spanning Tree Protocol
STP is defined in IEEE 802.1D. BPDUs STP messages are carried by Bridge Protocol Data Unit (BPDU) frames; BPDUs are multicast to 01:80:c2:00:00:00. BPDU types: Configuration – Used for spanning-tree computation…
CCNP BCMSN Notes – Aggregating Switch Links
EtherChannel Load Balancing EtherChannel distributes load across multiple physical links by examining between one and three low order bits of an arbitrary address. XOR is used when multiple addresses are examined. Address…
CCNP BCMSN Notes – VLAN Trunking Protocol
VTP modes: Client – Rely on VLAN information advertised by a server; no local configuration possible Server – Have full control over VLAN creation and modification for the VTP domain…
CCNP BCMSN Notes – VLANs and Trunks
The normal range allows for VLANs 1 -1005; IEEE 802.1Q expands this to 1 – 4095. VTP version 1 and 2 only support VLANs 1 – 1005. VTPv3 will support extended VLANs…
CCNP BCMSN Notes – Switch Port Configuration
IEEE standards: 802.3 – Ethernet 802.3u – Fast Ethernet 802.3z – Gigabit Ethernet 802.3ab – Gigabit Ethernet over copper (1000Base-T) 802.3ae – 10 Gigabit Ethernet
CCNP BCMSN Notes – Switch Operation
Layer 2 Switching Switching Decision Factors in a switching decision: Layer 2 forwarding table – Content Addressable Memory (CAM) table Security ACLs – Access lists are stored in compiled form in the…