quagga安装 1.软件依赖
automake: 1.9.6 (released 2005-07-10)
autoconf: 2.59 (2.60 on 2006-06-26 is too recent to require)
libtool: 1.5.22 (released 2005-12-18)
texinfo: 4.7 (released 2004-04-10; 4.8 is not yet common)
GNU AWK: gawk3.1.5 (released 2005-08-12)

错误提示1、
configure: error: vtysh needs libreadline but was not found and usable on your system.
yum install readline-devel
错误提示2、
checking for CARES... configure: error: Package requirements (libcares) were not met:

No package 'libcares' found

Consider adjusting the PKG_CONFIG_PATH environment variable if you
installed software in a non-standard prefix.

Alternatively, you may set the environment variables CARES_CFLAGS
and CARES_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details.
下载文件包：c-ares-1.12.0.tar

https://c-ares.haxx.se/download/
解压，
Configure
Make
Make install
cp libcares.pc /usr/local/lib/pkgconfig
PKG_CONFIG_PATH=/usr/local/lib/pkgconfig
export PKG_CONFIG_PATH
用第三方库，就少不了要使用到第三方的头文件和库文件。我们在编译、链接的时候，必须要指定这些头文件和库文件的位置。

tar zxvf quagga-quagga-1.2.2
cd quagga-quagga-1.2.2
./bootstrap.sh
mkdir /usr/local/zebra
./configure --prefix=/usr/local/zebra --enable-user=root --enable-group=root --enable-vty-group=root
Quagga configuration

quagga version : 1.2.2
host operating system : linux-gnu
source code location : .
compiler : gcc -std=gnu99
compiler flags : -g -O2 -g -Os --param=ssp-buffer-size=4 -D_FORTIFY_SOURCE=2 -Wformat -Wformat-security -fpie -fno-omit-frame-pointer -Wall -Wextra -Wmissing-prototypes -Wmissing-declarations -Wpointer-arith -Wbad-function-cast -Wwrite-strings -Wno-unused-result -Wno-unused-parameter -Wno-missing-field-initializers
make : make
linker flags : -lcrypt -lrt -lreadline -ltermcap -lm
state file directory : /var/run
config file directory : /usr/local/zebra/etc
example directory : /usr/local/zebra/etc
user to run as : root
group to run as : root
group for vty sockets : root
config file mask : 0600
log file mask : 0600
zebra protobuf enabled : no

The above user and group must have read/write access to the state file
directory and to the config files in the config file directory.
make && make install

cd /usr/local/zebra/etc/
cp bgpd.conf.sample bgpd.conf
cp isisd.conf.sample isisd.conf
cp ospfd.conf.sample ospfd.conf
cp vtysh.conf.sample vtysh.conf
cp zebra.conf.sample zebra.conf

vi /etc/rc.local
##zebra config
/usr/local/zebra/sbin/zebra -d &
/usr/local/zebra/sbin/bgpd -d &
/usr/local/zebra/sbin/isisd -d &
/usr/local/zebra/sbin/ospfd -d &

vi .bash_profile
PATH=$PATH:$HOME/bin:/usr/local/zebra/bin:/usr/local/zebra/sbin
export PATH

yum install conntrack-tools
vi /etc/conntrackd/conntrackd.conf
General {
Nice -1
HashSize 262144
HashLimit 655350
LogFile on
LockFile /var/lock/conntrack.lock
UNIX {
Path /var/run/conntrackd.ctl
Backlog 20
}
NetlinkBufferSizeMaxGrowth 655355
Filter {
Protocol Accept {
TCP
udp
}
Address Ignore {
IPv4_address 127.0.0.1 # loopback
}
}
}
Stats {
LogFile /natlog/conn.log
}