sflow配置Cisco Nexus 9396PQ

Question

我们有思科与M12PQ 12x40G创业板扩展卡Nexus开关。今天，当我在一个40G接口上启用sflow时，我得到了以下错误：

# sflow data-source interface e2/12
In order to enable sFlow sampling on North star front panel port(Ethernet2/12), please either carve both span and sflow tcam regions with non-zero sizes using the commands
'hardware access-list tcam region span <size>'
'hardware access-list tcam region sflow <size>'
or remove both span and sflow tcam regions and carve a span-sflow tcam region with a non-zero size using the commands 

我发现这篇文章与以下相关：https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/7-x/system_管理/配置/指南/b_西斯科_尼克斯_9000_系列__系统_管理_配置_指南_7x/b_西斯科_尼克斯_9000_系列__系统_管理_配置_指南_七倍_第二章_011000.pdf

我目前使用的tcam如下所示：

# show hardware access-list resource utilization

slot  1
=======



INSTANCE 0x0
-------------


         ACL Hardware Resource Utilization (Mod 1)
         ----------------------------------------------------------
                                        Used    Free    Percent
                                                        Utilization
-------------------------------------------------------------------
Ingress IPv4 PACL                       3       509     0.59
Ingress IPv4 Port QoS                   4       252     1.56
Ingress IPv4 VACL                       2       510     0.39
Ingress IPv4 RACL                       221     291     43.16
Egress IPv4 VACL                        3       509     0.59
Egress IPv4 RACL                        3       253     1.17
SUP COPP                                205     51      80.08
SUP COPP Reason Code TCAM               6       122     4.69
Redirect                                2       510     0.39
SPAN                                    21      235     8.20
VPC Convergence                         1       255     0.39

LOU                                     2       22      8.33
Both LOU Operands                       2
Single LOU Operands                     0
LOU L4 src port:                        1
LOU L4 dst port:                        1
LOU L3 packet len:                      0
LOU IP tos:                             0
LOU IP dscp:                            0
LOU ip precedence:                      0
LOU ip TTL:                             0
TCP Flags                               0       16      0.00

Protocol CAM                            2       244     0.81
Mac Etype/Proto CAM                     0       14      0.00

L4 op labels, Tcam 0                    0       1023    0.00
L4 op labels, Tcam 2                    1       62      1.58
L4 op labels, Tcam 6                    0       2047    0.00

Ingress Dest info table                 0       512     0.00
Egress Dest info table                  0       512     0.00


INSTANCE 0x1
-------------


         ACL Hardware Resource Utilization (Mod 1)
         ----------------------------------------------------------
                                        Used    Free    Percent
                                                        Utilization
-------------------------------------------------------------------
Ingress NS IPv4 Port QoS                1       255     0.39
Ingress NS IPv4 L3 QoS                  1       255     0.39
Ingress NS IPv4 VLAN QoS                1       255     0.39

LOU                                     0       24      0.00
Both LOU Operands                       0
Single LOU Operands                     0
LOU L4 src port:                        0
LOU L4 dst port:                        0
LOU L3 packet len:                      0
LOU IP tos:                             0
LOU IP dscp:                            0
LOU ip precedence:                      0
LOU ip TTL:                             0
TCP Flags                               0       16      0.00

Protocol CAM                            0       246     0.00
Mac Etype/Proto CAM                     0       14      0.00

L4 op labels, Tcam 0                    0       7       0.00
L4 op labels, Tcam 2                    0       7       0.00
L4 op labels, Tcam 6                    0       2047    0.00

Ingress Dest info table                 0       512     0.00
Egress Dest info table                  0       512     0.00

现在的问题是，为什么在上面的输出中没有看到任何span或sflow区域，我在这里有哪些选项可以让它工作呢？

Answer 1

#溶液

在这个平台中，sflow默认分配了零0 tcam片。

sFlow尺寸

# show hardware access-list tcam region | grep "sFlow ACL"
                               sFlow ACL [sflow] size =    0
                     SPAN+sFlow ACL [span-sflow] size =    0

跨距TCAM尺寸

# show hardware access-list tcam region | grep "SPAN"
                                     SPAN [span] size =  256
                     SPAN+sFlow ACL [span-sflow] size =    0

如果您没有使用SPAN端口的计划，那么您可以从span中获取256片，并将其分配给sflow。

# hardware access-list tcam region span 0
# hardware access-list tcam region sflow 256

在重新启动/重新启动交换机之后，您可以看到以下结果

# show hardware access-list tcam region | grep -i sflow
                               sFlow ACL [sflow] size =  256
                     SPAN+sFlow ACL [span-sflow] size =    0

现在您可以使用sFlow了