Display the IP unicast FIB, unicast FIB, and unicast tree
About this task
In SPBM, Backbone MAC (B-MAC) addresses are carried within the IS-IS link-state database. To do this, SPBM supports an IS-IS Type-Length-Value (TLV) that advertises the Service Instance Identifier (I-SID) and B-MAC information across the network. Each node has a System ID, which also serves as B-MAC of the switch. These B-MAC addresses are populated into the SPBM Forwarding Information Base (FIB).
When the network topology is discovered and stored in the IS-IS link-state database, each node calculates shortest path trees for each source node, so that a unicast path now exists from every node to every other node. With this information, each node populates unicast information received from SPBM into the FIB for forwarding purposes.
I-SIDs are only used for virtual services (Layer 2 VSNs and Layer 3 VSNs). If you only enable IP Shortcuts on the Backbone Edge Bridges, I-SIDs are never exchanged in the network as IP Shortcuts allow Global Routing Table (GRT) IP networks to be transported across IS-IS.
The show isis spbm ip-unicast-fib or show isis spbm ipv6-unicast-fib command displays all of the IS-IS routes in the IS-IS LSDB. The IP ROUTE PREFERENCE column in the show output displays the IP route preference.
Routes within the same VSN are added to the LSDB with a default preference of 7. Inter-VSN routes are added to the LSDB with a route preference of 200. IS-IS accept policies enable you to change the route preference for incoming routes. If the same route is learned from multiple sources with different route preferences, then the routes are not considered equal cost multipath (ECMP) routes. The route with the lowest route preference is the preferred route. In Layer 2, in the event of a tie-break between routes from multiple sources, the tie-breaking is based on cost and hop count.
Procedure
Examples
Switch# show isis spbm ip-unicast-fib
==========================================================================================
SPBM IP-UNICAST FIB ENTRY INFO
==========================================================================================
VRF DEST OUTGOING SPBM PREFIX PREFIX IP ROUTE
VRF ISID ISID Destination NH BEB VLAN INTERFACE COST COST TYPE PREFERENCE
------------------------------------------------------------------------------------------
GRT - - 10.133.136.0/24 4K3(*) 4058 1/3 10 1 Internal 7
GRT - - 10.133.136.0/24 4K3(*) 4059 1/3 10 1 Internal 7
GRT - - 10.133.136.0/24 4K4(*) 4058 to_4k4 10000 1 Internal 7
GRT - - 10.133.136.0/24 4K4(*) 4059 to_4k4 10000 1 Internal 7
------------------------------------------------------------------------------------------
Total number of SPBM IP-UNICAST FIB entries 4
------------------------------------------------------------------------------------------
Switch# show isis spbm ip-unicast-fib id 10002
==========================================================================================
SPBM IP-UNICAST FIB ENTRY INFO
==========================================================================================
VRF DEST OUTGOING SPBM PREFIX PREFIX IP ROUTE
VRF ISID ISID Destination NH BEB VLAN INTERFACE COST COST TYPE PREFERENCE
------------------------------------------------------------------------------------------
vrf2 - 10002 65.2.2.0/24 ESS2 1000 1/13 20 20 Internal 7
vrf2 - 10002 65.2.2.0/24 ESS2 1001 1/18 20 20 Internal 7
------------------------------------------------------------------------------------------
Total number of SPBM IP-UNICAST FIB entries 2
------------------------------------------------------------------------------------------
Switch# show isis spbm ip-unicast-fib all
==========================================================================================
SPBM IP-UNICAST FIB ENTRY INFO
==========================================================================================
VRF DEST OUTGOING SPBM PREFIX PREFIX IP ROUTE
VRF ISID ISID Destination NH BEB VLAN INTERFACE COST COST TYPE PREFERENCE
------------------------------------------------------------------------------------------
GRT - - 1.0.0.1/32 ESP0 1000 1/13 20 1 Internal 7
GRT - - 1.0.0.1/32 ESP0 1000 1/18 20 1 Internal 7
vrf2 - 10002 65.2.2.0/24 ESS2 1000 1/13 20 20 Internal 7
vrf2 - 10002 65.2.2.0/24 ESS2 1001 1/18 20 20 Internal 7
------------------------------------------------------------------------------------------
Total number of SPBM IP-UNICAST FIB entries 4
------------------------------------------------------------------------------------------
Switch# show isis spbm unicast-fib
================================================================================
SPBM UNICAST FIB ENTRY INFO
================================================================================
DESTINATION BVLAN SYSID HOST-NAME OUTGOING COST
ADDRESS INTERFACE
--------------------------------------------------------------------------------
00:16:ca:23:73:df 1000 0016.ca23.73df SPBM-1 1/21 10
00:16:ca:23:73:df 2000 0016.ca23.73df SPBM-1 1/21 10
00:18:b0:bb:b3:df 1000 0018.b0bb.b3df SPBM-2 MLT-2 10
00:14:c7:e1:33:e0 1000 0018.b0bb.b3df SPBM-2 MLT-2 10
00:18:b0:bb:b3:df 2000 0018.b0bb.b3df SPBM-2 MLT-2 10
--------------------------------------------------------------------------------
Total number of SPBM UNICAST FIB entries 5
--------------------------------------------------------------------------------
Switch# show isis spbm ipv6-unicast-fib
==============================================================================================
SPBM IPv6-UNICAST FIB ENTRY INFO
==============================================================================================
VRF Dest OUTGOING SPBM PREFIX METRIC
VRF ISID ISID Destination NH BEB VLAN INTERFACE COST COST TYPE
----------------------------------------------------------------------------------------------
GRT - - 00:16:ca:23:73:df el2 10 10/22 10 1 Internal
GRT - 11 00:16:ca:23:73:df esp 20 10/22 10 1 Internal
vrf1 11 100 00:18:b0:bb:b3:df el2 10 10/22 10 1 External
vrf1 11 11 00:14:c7:e1:33:e0 ess 20 10/22 10 1 External
----------------------------------------------------------------------------------------------
Total number of SPBM IPv6-UNICAST FIB entries 4
----------------------------------------------------------------------------------------------
Variable Definitions
The following table defines parameters for the show isis spbm ip-unicast-fib command.
|
Variable |
Value |
|---|---|
|
all |
Displays entries for the Global Routing Table (GRT) and all Virtual Routing and Forwarding (VRF) instances. Note:
If you use the command show isis spbm ip-unicast-fib the device displays only GRT entries. The command shows IP routes from remote Backbone Edge Bridges (BEBs). |
|
id <1–16777215> |
Displays IS-IS SPBM IP unicast Forwarding Information Base (FIB) information by Service Instance Identifier (I-SID) ID. |
|
spbm-nh-as-mac |
Displays the next hop B-MAC of the IP unicast FIB entry. |
The following table defines parameters for the show isis spbm ipv6-unicast-fib command.
|
Variable |
Value |
|---|---|
|
all |
Displays entries for the Global Routing Table (GRT) and all Virtual Routing and Forwarding (VRF) instances. Note:
If you use the command show isis spbm ipv6-unicast-fib the device displays only GRT entries. The command shows IPv6 routes from remote Backbone Edge Bridges (BEBs). |
|
id <1–16777215> |
Displays IS-IS SPBM IPv6 unicast Forwarding Information Base (FIB) information by Service Instance Identifier (I-SID) ID. |
|
spbm-nh-as-mac |
Displays the next hop as MAC of the IPv6 unicast FIB entry. |
The following table defines parameters for the show isis spbm unicast-fib command.
|
Variable |
Value |
|---|---|
|
b-mac <0x00:0x00:0x00:0x00:0x00:0x00> |
Displays the FIB for the specified BMAC. |
|
vlan <1-4059> |
Displays the FIB for the specified SPBM VLAN. |
|
summary |
Displays a summary of the FIB. |
The following table defines parameters for the show isis spbm unicast-tree command.
|
Variable |
Value |
|---|---|
|
<1-4059> |
Specifies the SPBM B-VLAN ID. |
|
destination <xxxx.xxxx.xxxx> |
Displays the unicast tree for the specified destination. |
Job Aid
The following sections describe the fields in the outputs for SPBM unicast FIB and unicast tree show commands.
show isis spbm ip-unicast-fib
The following table describes the fields in the output for the show isis spbm ip-unicast-fib command.
|
Parameter |
Description |
|---|---|
|
VRF |
Specifies the VRF ID of the IP unicast FIB entry, 0 indicates NRE. |
|
VRF ISID |
Specifies the I-SID of the IP unicast FIB entry. |
|
DEST ISID |
Specifies the destination I-SID of the IP unicast FIB entry. |
|
Destination |
Specifies the destination IP address of the IP unicast FIB entry. |
|
NH BEB |
Specifies the next hop B-MAC of the IP unicast FIB entry. |
|
VLAN |
Specifies the VLAN of the IP unicast FIB entry. |
|
OUTGOING INTERFACE |
Specifies the outgoing port of the IP unicast FIB. |
|
SPBM COST |
Specifies the B-MAC cost of the IP unicast FIB entry. |
|
PREFIX COST |
Specifies the prefix cost of the IP unicast FIB entry. |
|
PREFIX TYPE |
Specifies the prefix type of the IP unicast FIB entry. |
|
IP ROUTE PREFERENCE |
Specifies the IP route preference of the IP unicast FIB entry. |
show isis spbm ipv6-unicast-fib
The following table describes the fields in the output for the show isis spbm ipv6-unicast-fib command.
|
Parameter |
Dsecription |
|---|---|
|
VRF |
Specifies the VRF ID of the IPv6 unicast FIB entry, 0 indicates NRE. |
|
VRF ISID |
Specifies the I-SID of the IPv6 unicast FIB entry. |
|
DEST ISID |
Specifies the destination I-SID of the IPv6 unicast FIB entry. |
|
Destination |
Specifies the destination IPv6 address of the IPv6 unicast FIB entry. |
|
NH BEB |
Specifies the next hop B-MAC of the IPv6 unicast FIB entry. |
|
VLAN |
Specifies the VLAN of the IPv6 unicast FIB entry. |
|
OUTGOING INTERFACE |
Specifies the outgoing port of the IPv6 unicast FIB. |
|
SPBM COST |
Specifies the B-MAC cost of the IPv6 unicast FIB entry. |
|
PREFIX COST |
Specifies the prefix cost of the IPv6 unicast FIB entry. |
|
METRIC TYPE |
Specifies the metric type. Specifies an internal or a extrenal metric. For internal metric type, the cost of the external routes is equal to the sum of all internal costs and the external cost. For external metric type, the cost of the external routes is equal to the external cost alone. The default is internal. |
show isis spbm unicast-fib
The following table describes the fields in the output for the show isis spbm unicast-fib command.
|
Parameter |
Description |
|---|---|
|
DESTINATION ADDRESS |
Indicates the destination MAC Address of the unicast FIB entry. |
|
BVLAN |
Indicates the B-VLAN of the unicast FIB entry. |
|
SYSID |
Indicates the destination system identifier of the unicast FIB entry. |
|
HOST-NAME |
Indicates the destination host name of the unicast FIB entry. |
|
OUTGOING INTERFACE |
Indicates the outgoing interface of the unicast FIB entry. |
|
COST |
Indicates the cost of the unicast FIB entry. |