Table Of Contents
E Commands
This chapter describes the Cisco NX-OS Multiprotocol Label Switching commands that begin with E.
exclude-address
To specify an IP address while configuring a traffic engineering (TE) explicit-path that TE should avoid using while calculating the label switched path (LSP), use the exclude-address command.
exclude-address ip-address
Syntax Description
Defaults
None
Command Modes
Explicit-path configuration mode
Supported User Rolesnetwork-admin
vdc-adminCommand History
Usage Guidelines
Both primary and backup tunnel paths can be dynamic or explicit and they do not have to use the exclude-address. Because backup tunnels must avoid the protected link or node, you should use the exclude-address command.
When using the exclude-address command to specify the path for a backup tunnel, you must exclude an interface IP address to avoid a link (for creating a next-hop [NHOP] backup tunnel), or a router ID address to avoid a node (for creating an next-next-hop [NNHOP] backup tunnel).
This command requires the MPLS Services license.
Examples
This example shows how to specify an address to exclude while configuring an explicit-path:
switch# configure terminal
switch(config)# mpls traffic-eng configuration
switch(config-te)# explicit-path name avoid-protected-link
switch(config-te-expl-path)# exclude-address 3.3.3.3
1: exclude-address 3.3.3.3switch(config-te-expl-path)#Related Commands
exp
To configure the EXP bits that are forwarded over the member tunnel, use the exp command.
exp [list-of-exp-values] [default]
Syntax Description
Defaults
The member tunnel will forward the packets with the EXP bits that are not being forwarded by other member tunnels that are part of the same bundle.
Command Modes
cbts-member configuration mode
Supported User Rolesnetwork-admin
vdc-adminCommand History
Usage Guidelines
You cannot configure the following traffic engineering (TE) commands on a class-based tunnel selection (CBTS) member tunnels (auto-bw; autoroute; backup-bw; description; destination; fowarding-adjacency; inherit; source).
This command requires the MPLS Services license.
Examples
This example shows how to configure the EXP bits that are forwarded over the member tunnel:
switch# configure terminal
switch(config)# interface tunnel-te 1
switch(config-if-te)# cbts-member tunnel-te 251
switch(config-cbts-member)# exp 5
Related Commands
explicit-null
To configure an advertised explicit null label in place of an implicit null label, use the explicit-null command. To return to the default setting, use the no form of this command.
explicit-null [for prefix-list | to prefix-list | for prefix-list to prefix-list]
no explicit-null [for prefix-list | to prefix-list | for prefix-list to prefix-list]
Syntax Description
Defaults
None
Command Modes
LDP configuration mode
Supported User Rolesnetwork-admin
vdc-adminCommand History
Usage Guidelines
This command requires the MPLS Services license.
Examples
This example shows how to configure an explicit null label on an egress Label Switching Router (LSR), which causes that LSR to advertise the explicit null label to all adjacent MPLS routers:
switch(config-ldp)# explicit-null
switch(config-ldp)#This example shows how to configure an explicit null label and specify the for keyword with a prefix list:
switch(config-ldp)# explicit-null for prefix-list
switch(config-ldp)#This example shows how to configure an explicit null label and specify the to keyword with a prefix list:
switch(config-ldp)# explicit-null to prefix-list
switch(config-ldp)#Related Commands
Command Descriptionmpls ldp configuration
Configures the Multiprotocol Label Switching (MPLS) Label Distribution Protocol (LDP).
explicit-path
To configure an IP explicit path to be used by tunnel-te label switched path (LSPs), or a path dynamically calculated from the TE topology database, use the explicit-path command. To restore the system to its default condition, use the no form of this command.
explicit-path {name path-name | identifier number}
no explicit-path {name path-name | identifier number}
Syntax Description
Defaults
None
Command Modes
TE configuration mode
Supported User Rolesnetwork-admin
vdc-adminCommand History
Usage Guidelines
This command requires the MPLS Services license.
Examples
This example shows how to configure the tunnel to use a named IP explicit path or a path dynamically calculated from the TE topology database:
switch# configure terminal
switch(config)# mpls traffic-eng configuration
switch(config-te)# explicit-path name avoid-protected-link
switch(config-te-expl-path)#Related Commands
Command Descriptionmpls traffic-eng configuration
Configures the Multiprotocol Label Switching (MPLS) Traffic Engineering Protocol (MPLS-TE).